WARREN COUNTY, PENNSYLVANIA - rampp€¦ · warren county, pennsylvania (all jurisdictions)...

WARREN COUNTY, PENNSYLVANIA (ALL JURISDICTIONS) COMMUNITY NAME COMMUNITY NUMBER BEAR LAKE, BOROUGH OF 422544 BROKENSTRAW, TOWNSHIP OF 422115 CHERRY GROVE, TOWNSHIP OF 422545 CLARENDON, BOROUGH OF 421221 COLUMBUS, TOWNSHIP OF 422116 CONEWANGO, TOWNSHIP OF 422117 DEERFIELD, TOWNSHIP OF 422118 ELDRED, TOWNSHIP OF 422546 ELK, TOWNSHIP OF 422119 FARMINGTON, TOWNSHIP OF 422120 FREEHOLD, TOWNSHIP OF 422121 GLADE, TOWNSHIP OF 422122 LIMESTONE, TOWNSHIP OF 422547 MEAD, TOWNSHIP OF 422123

COMMUNITY NAME COMMUNITY NUMBER PINE GROVE, TOWNSHIP OF 422124 PITTSFIELD, TOWNSHIP OF 422125 PLEASANT, TOWNSHIP OF 422548 SHEFFIELD, TOWNSHIP OF 422126 SOUTHWEST, TOWNSHIP OF 422127 SPRING CREEK, TOWNSHIP OF 422128 SUGAR GROVE, BOROUGH OF 420842 SUGAR GROVE, TOWNSHIP OF 422549 TIDIOUTE, BOROUGH OF 422114 TRIUMPH, TOWNSHIP OF 422550 WARREN, CITY OF 420843 WATSON, TOWNSHIP OF 422551 YOUNGSVILLE, BOROUGH OF 420844

FLOOD INSURANCE STUDY NUMBER 42123CV000A

PRELIMINARY:

June 11, 2010

Warren County

NOTICE TO

FLOOD INSURANCE STUDY USERS

Communities participating in the National Flood Insurance Program have established

repositories of flood hazard data for floodplain management and flood insurance

purposes. This Flood Insurance Study (FIS) report may not contain all data available

within the Community Map Repository. Please contact the Community Map Repository for any additional data.

The Federal Emergency Management Agency (FEMA) may revise and republish part or all of this FIS report at any time. In addition, FEMA may revise part of this FIS

report by the Letter of Map Revision process, which does not involve republication or

redistribution of the FIS report. Therefore, users should consult with community officials and check the Community Map Repository to obtain the most current FIS

report components.

Selected Flood Insurance Rate Map (FIRM) panels for this community contain information that was previously shown separately on the corresponding Flood

Boundary and Floodway Map (FBFM) panels (e.g., floodways, cross sections). In

addition, former flood hazard zone designations have been changed as follows:

Old Zone(s) New Zone

Al through A30 AE

B X

C X

Initial Countywide FIS Effective Date:

i

TABLE OF CONTENTS

1.0 INTRODUCTION .................................................................................................... 1

1.1 Purpose of Study ............................................................................................ 1

1.2 Authority and Acknowledgments ................................................................... 1

1.3 Coordination .................................................................................................. 3

2.0 AREA STUDIED ...................................................................................................... 4

2.1 Scope of Study ............................................................................................... 4

2.2 Community Description ................................................................................. 5

2.3 Principal Flood Problems ............................................................................... 8

2.4 Flood Protection Measures ........................................................................... 11

3.0 ENGINEERING METHODS ................................................................................ 11

3.1 Hydrologic Analyses .................................................................................... 12

3.2 Hydraulic Analyses ...................................................................................... 16

3.3 Vertical Datum ............................................................................................ 19

4.0 FLOODPLAIN MANAGEMENT APPLICATIONS ........................................... 21

4.1 Floodplain Boundaries ................................................................................. 21

4.2 Floodways ................................................................................................... 22

5.0 INSURANCE APPLICATIONS ............................................................................ 30

6.0 FLOOD INSURANCE RATE MAP ...................................................................... 31

7.0 OTHER STUDIES ................................................................................................. 34

8.0 LOCATION OF DATA .......................................................................................... 34

9.0 BIBLIOGRAPHY AND REFERENCES............................................................... 34

ii

TABLE OF CONTENTS (Continued)

FIGURES

Figure 1 – Floodway Schematic ............................................................................................ 23

TABLES

Table 1 – Initial and Final CCO Meetings ............................................................................ 3-4

Table 2 – Areas Studied by Detailed Methods ...................................................................... 4-5

Table 3 – Letters Of Map Change (LOMCs) ........................................................................... 5

Table 4 – Historical Floods on the Allegheny River................................................................. 9

Table 5 – Historical Floods on Brokenstraw Creek ................................................................ 10

Table 6 – Historical Floods on Conewango Creek ................................................................. 10

Table 7 – Summary of Discharges .................................................................................... 13-15

Table 8 – Manning’s “n” Value Table ................................................................................... 18

Table 9 – Vertical Datum Conversion Values ........................................................................ 20

Table 10 – Floodway Data ............................................................................................... 24-29

Table 11 – Community Map History ................................................................................ 32-33

EXHIBITS

Exhibit 1 – Flood Profiles

Akeley Run Panels 01P-03P

Allegheny River Panels 04P-20P

Brokenstraw Creek Panels 21P-27P Conewango Creek Panels 28P-38P

Glade Run Panels 39P-42P

Indian Camp Run Panel 43P

Irvine Run Panels 44P-47P Jackson Run Panels 48P-50P

Matthews Run Panels 51P-54P

North Branch Akeley Run Panels 55P-59P Stillwater Creek Panel 60P

Tributary No. 1 to Stillwater Creek Panels 61P-62P

Tributary No. 2 to Stillwater Creek Panel 63P Tributary No. 3 to Stillwater Creek Panel 64P

Exhibit 2 – Flood Insurance Rate Map Index Flood Insurance Rate Map

1

FLOOD INSURANCE STUDY

WARREN COUNTY, PENNSYLVANIA

(ALL JURISDICTIONS)

1.0 INTRODUCTION

1.1 Purpose of Study

This Flood Insurance Study (FIS) report investigates the existence and severity of flood

hazards in the geographic area of Warren County, Pennsylvania, including the City of

Warren; the Boroughs of Bear Lake, Clarendon, Sugar Grove, Tidioute, and Youngsville; and the Townships of Brokenstraw, Cherry Grove, Columbus, Conewango, Deerfield,

Eldred, Elk, Farmington, Freehold, Glade, Limestone, Mead, Pine Grove, Pittsfield,

Pleasant, Sheffield, Southwest, Spring Creek, Sugar Grove, Triumph, and Watson (referred to collectively herein as Warren County), and aids in the administration of the

National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973.

This study has developed flood-risk data for various areas of the community that will be

used to establish actuarial flood insurance rates and to assist the community in its efforts to promote sound floodplain management. Minimum floodplain management

requirements for participation in the National Flood Insurance Program (NFIP) are set

forth in the Code of Federal Regulations at 44 CFR, 60.3.

In some states or communities, floodplain management criteria or regulations may exist

that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the State or other

jurisdictional agency will be able to explain them.

1.2 Authority and Acknowledgments

The sources of authority for this FIS are the National Flood Insurance Act of 1968 and

the Flood Disaster Protection Act of 1973.

This FIS was prepared to include all jurisdictions within Warren County into a

countywide format. Information on the authority and acknowledgements for each of the

previously printed FISs and Flood Insurance Rate Maps (FIRMs) for communities within

Warren County was compiled, and is shown below.

Brokenstraw,

Township of:

The hydrologic and hydraulic analyses for the March 18, 1991

study (Reference 1) were prepared by the U.S. Army Corps of Engineers (USACE), Pittsburgh District, for the Federal

Emergency Management Agency (FEMA), under Inter-Agency

Agreement No. EMW-87-E-2509, Project Order No. 3. This work was completed in March 1989.

2

Conewango,

Township of:

The hydrologic and hydraulic analyses for the August 19, 1987

study (Reference 2) were prepared by the USACE, Pittsburgh District, for FEMA, under Inter-Agency Agreement No. EMW-

E-1153, Project Order No. 1, Amendment No. 20. This work was

completed in February 1986.

The hydraulic analyses in the April 16, 1990 revision for Jackson

Run were prepared by Northwest Engineering. FEMA reviewed

and accepted these data for purposes of this revision.

Glade, Township

of:

The hydrologic and hydraulic analyses for the September 4, 1987


E-1153, Project Order No. 1, Amendment No. 20. The work for

this study was completed in February 1986.

Mead, Township

of:

The hydrologic and hydraulic analyses for the November 4, 1988

study (Reference 4) were prepared during the preparation of the

FIS for the Township of Glade. The work for that study was prepared by the USACE, Pittsburgh District, for FEMA, under

Inter-Agency Agreement No. EMW-E-1153, Project Order No.

1, Amendment No. 20. The work for this study was completed in February 1986.

Pine Grove,

Township of:



E-1153, Project Order No. 1, Amendment No. 20. This work was

completed in February 1986.

Pleasant,

Township of:

The hydrologic and hydraulic analyses for the January 5, 1989

study (Reference 6) were prepared by the USACE, Pittsburgh

District, during the preparation of the FIS for the City of Warren and the Township of Conewango. This work was completed in

February 1986.

Sugar Grove,

Borough of:


study (Reference 7) were prepared by the USACE, Pittsburgh

District, for FEMA, under inter-Agency Agreement No. EMW-87-E-2509, Project Order No. 3. This work was completed in

March 1989.

Warren, City of: The hydrologic and hydraulic analyses for the August 19, 1987 study (Reference 8) were prepared by the USACE, Pittsburgh

District, for FEMA, under Inter-Agency Agreement No. EMW-

E-1153, Project Order No. 1, Amendment No. 20. This work was completed in February 1986.

3

Youngsville,

Borough of:



87-E-2509, Project Order No. 3. This work was completed in

March 1989.

No previous reports were prepared for the Boroughs of Bear Lake, Clarendon, Tidioute,

and the Townships of Cherry Grove, Columbus, Deerfield, Eldred, Elk, Farmington,

Freehold, Limestone, Pittsfield, Sheffield, Southwest, Spring Creek, Sugar Grove, Triumph, and Watson.

For this countywide FIS, the Digital Flood Insurance Rate Map (DFIRM) database and mapping were prepared for FEMA by GG3, a joint venture between Gannett Fleming,

Inc, Camp Hill, Pennsylvania, and Greenhorne & O’Mara, Inc., Laurel, Maryland under

the Joint Venture Contract No. EMP-2003-CO-2606, Task Order Number 10. This work

was completed in September 2009.

For this county wide study, all Zone AEs will be redelineated using LIDAR data flown in

2006. For streams studied with approximate methods, the 1-percent-annual-chance flood elevations were determined from the regional relationship between drainage area and

flood depth prepared by the U.S. Geological Survey (USGS). This relationship was

developed by means of regional regression analyses of basin areas and the within channel 1-percent-annual-chance flood depths observed at stream gages. Depths were adjusted on

the basis of hydraulic calculations to account for increased depth due to backwater from

hydraulic structures, such as bridges and culverts.

Base map information shown on the FIRM was derived from PAMAP Program,

Pennsylvania Department of Conservation and Natural Resources, Bureau of

Topographic and Geologic Survey. The projection used in the preparation of this map is Pennsylvania State Plane North Zone (FIPS Zone 3701), and the horizontal datum used is

North American Datum 1983, GRS Spheroid.

1.3 Coordination

The purpose of an initial Consultation Coordination Officer’s (CCO) meeting is to

discuss the scope of the FIS. A final CCO meeting is held to review the results of the

study. The initial and final meeting dates for the previous FIS reports for Warren County and its communities are listed in Table 1, “Initial and Final CCO Meetings”.

Table 1 – Initial and Final CCO Meetings

COMMUNITY NAME INITIAL MEETING FINAL MEETING

Brokenstraw, Township of December 10, 1985 March 6, 1990

Conewango, Township of July 26, 1983 September 29, 1986

Glade, Township of July 26, 1983 September 29, 1986

Mead, Township of December 8, 1986 December 2, 1987

4

Table 1 – Initial and Final CCO Meetings (Continued)

COMMUNITY NAME INITIAL MEETING FINAL MEETING

Pine Grove, Township of July 26, 1983 September 29, 1986

Pleasant, Township of December 11, 1986 December 2, 1987

Sugar Grove, Borough of December 10, 1985 September 19, 1989

Warren, City of July 26, 1983 September 29, 1986

Youngsville, Borough of December 10, 1985 September 19, 1989

2.0 AREA STUDIED

2.1 Scope of Study

This FIS covers the geographic area of Warren County, Pennsylvania, including incorporate communities listed in Section 1.1. The areas studied by detailed methods

were selected with priority given to all known flood hazards and areas of projected

development or proposed construction. Table 2, “Areas Studied by Detailed Methods”, lists the streams that were studied by detailed methods.

Table 2 – Areas Studied by Detailed Methods

Stream Limits of Detailed Study

Akeley Run Confluence with Conewango Creek to Priest Hollow

Road (L.R. 61050)

Allegheny River Approximately 4.65 miles downstream of U.S. Route 62 to approximately 6.49 miles upstream of U.S. Route 6

Brokenstraw Creek Confluence with Allegheny River to approximately 0.27 mile upstream of Airport Road

Conewango Creek Confluence with Allegheny River to approximately 3.02

miles upstream of U.S. Route 62

Glade Run Confluence with Allegheny River to approximately 900

feet upstream Access Road

Indian Camp Run Confluence with Brokenstraw Creek to approximately

145 feet upstream Indian Camp Run Road

Irvine Run Confluence of Brokenstraw Creek to approximately

2.04 miles upstream Private Road

Jackson Run Confluence with Conewango Creek to approximately

0.42 mile upstream Trailer Park Road

5

Table 2 – Areas Studied by Detailed Methods (Continued)

Stream Limits of Detailed Study

Matthews Run Confluence with Brokenstraw Creek to approximately

1.17 miles upstream the confluence of Telick Run

North Branch Akeley Run Confluence with Conewango Creek to approximately 50

feet upstream of State Route 688

Stillwater Creek Approximately 1,187 feet downstream of School Road to approximately 1,400 feet downstream of confluence

with Tributary No. 3 Stillwater Creek

Tributary No. 1 to Stillwater Creek

Approximately 0.53 mile downstream of Jamestown Road to approximately 0.33 mile upstream of State

Route 69

Tributary No. 2 to Stillwater

Creek

Confluence with Stillwater Creek to approximately 0.37

mile upstream of Catline Road

Tributary No. 3 to Stillwater

Creek

Confluence with Stillwater to approximately 654 feet

upstream of Stillwater Road (State Route 957)

The areas studied by detailed methods were selected with priority given to all known

flood hazard and areas of projected development or proposed construction though Warren

County.

Approximate analyses were used to study those areas having a low development potential

or minimal flooding hazards. The scope and methods of study were proposed to, and

agreed upon, by FEMA and the communities.

This countywide FIS incorporates the determinations of Letters of Map Revisions

(LOMRs) issued by FEMA. Table 3, “Letters of Map Change (LOMCs)”, incorporated into this countywide study:

Table 3 – Letters Of Map Change (LOMCs)

LOMC Case Number Date Issued Project Identifier

LOMR 92-03-054P August 19, 1992 Allegheny River West Side Levee

Closure

2.2 Community Description

Warren County is located in northern Pennsylvania. It was formed in 1800 from parts of

Allegheny and Lycoming Counties; attached to Crawford County until 1805 and then to Venango County until Warren was formally organized in 1819. Its county seat is the City

of Warren. As of 2009, the population was estimated to be 40,638 (Reference 10).

According to the U.S. Census Bureau, the County has a total area of 883.45 mi

2. Notable

physical features include the Allegheny River, Allegheny Reservoir, Kinzua Dam and

Allegheny National Forest. The County is bordered on the north by Chautauqua County, New York, on the northeast by Cattaragus County, New York, on the west by Crawford

and Erie Counties, Pennsylvania, on the south by Forest County, Pennsylvania, on the

6

southeast by Elk County, Pennsylvania, on the southwest by Venango County,

Pennsylvania, and on the east by McKean County, Pennsylvania (Reference 11).

The average mean temperature ranges from 70 degrees Fahrenheit (ºF) in July to 24ºF in

January. The highest recorded temperature was 100ºF in 1988. The lowest recorded

temperature was -34ºF in 1979. Monthly precipitation averages approximately 3.76 inches, with the maximum monthly average occurring in June with 5.14 inches and the

minimum monthly average occurring in February with 2.40 inches (Reference 12).

Akeley Run, with a drainage area of 19.0 square miles at its confluence with Conewango

Creek, has its source near the Township of Pine Grove corporate limits, in the

northeastern portion of Warren County. It flows in a southwestern direction through Warren County for a distance of 3.4 miles where it meets Conewango Creek at the City

of Russell, Pennsylvania. The study reach extends a distance of 2.4 miles and meets

Conewango Creek at mile 7.7. The average slope of Akeley Run in the study area is 62.0

feet per mile. Local relief varies from a low of 1,220 feet to an average hilltop elevation of 1,900 feet. The valley floor varies in width from 100 to 300 feet (Reference 5).

The Allegheny River has a total drainage area of 11,778 square miles at its confluence with the Monongahela River. Together they form the Ohio River at Pittsburgh,

Pennsylvania. The headwaters of the Allegheny River are in the western slopes of the

Appalachian mountain range in Potter County in northwestern Pennsylvania. It flows in a northwestern direction from its source until it reaches Portville, New York, near the

New York-Pennsylvania border. It then flows west to Salamanca, New York, and

southward into Pennsylvania to its confluence with the Monongahela River, a total

distance of 322 miles. The study reach begins at Allegheny River Mile 181.8 and extends to mile 197.2 for a total distance of 20.35 miles. The average gradient in the

study reach is 3.1 to 3.5 feet per mile. Local relief above the stream valley varies from a

low of 1,129 feet to an average hilltop elevation of 2,000 feet. The valley floor varies in width from 0.1 mile to 0.6 mile (References 1, 2, 3, 4, 6, and 8).

Brokenstraw Creek, with a total drainage area of 338 square miles at its mouth, joins the

Allegheny River, at mile 181, near the Irvine area of the Township of Brokenstraw. Brokenstraw Creek flows towards the southeast from its source in the North Clymer,

New York. The average stream gradient is approximately eight feet per mile. Elevations

in the main valley vary from a low of 1,145 feet to 1,850 feet at the extreme headwaters. The average bedslope is approximately 10 to 11 feet per mile. Local relief above the

stream varies from a low of 1,145 feet to an average hilltop elevation of 1,850 feet. The

valley floor varies from 1,000 to 5,000 feet in width (References 1 and 9).

Conewango Creek, with a drainage area of 898 square miles at its confluence with the

Allegheny River, has its source in the northwestern part of Cattaraugus County, New

York. It flows in a generally southwestern direction through Cattaraugus and Chautauqua Counties in New York and Warren County, Pennsylvania, for a distance of

approximately 68 miles. It meets the Allegheny River at Warren, Pennsylvania. The

study limits extend from its confluence with the Allegheny River for a distance of 13.23 miles to the Pennsylvania/New York State boundary. The average bed slope of

Conewango Creek within the study area is 3.8 to 6.1 feet per mile. Local relief above the

stream valley varies from a low of 1,165 feet to an average hilltop elevation of 1,800 feet. The valley floor varies in width from 200 feet to 2,500 feet (References 2, 3, 5, and 8).

7

Glade Run, with a drainage area of 6.6 square miles at its confluence with the Allegheny

River, has its source in the central part of Warren County, Pennsylvania. It flows in a southwestern direction through Warren County for a distance of 3.7 miles, where it meets

the Allegheny River at the City of Warren. The study reach extends a distance of 2.9

miles from the mouth of Glade Run to approximately 1 mile upstream of Cosham Park

Avenue. The average slope of Glade Run in the study area is 50.6 to 123.8 feet per mile. Local relief varies from a low of 1,180 feet to an average hilltop elevation of 1,800 feet.

The valley floor varies in width from 100 to 300 feet (References 3 and 8).

Indian Camp Run, with a total drainage area of 2.5 square miles at its mouth, joins

Brokenstraw Creek at mile 3.6. It flows towards the south from its source approximately

two miles north of the Borough of Youngsville. The average stream gradient is approximately 140 feet per mile. Elevations in the main valley vary from a low of 1,190

feet to 1,800 feet at the extreme headwaters. The average bedslope is approximately 125

feet per mile. Local relief above the stream varies from a low of 1,190 feet to an average

hilltop elevation of 1,600 feet. The valley floor varies from 50 to 100 feet in width (Reference 9).

Irvine Run, with a total drainage of 9.18 square miles at its mouth, joins Brokenstraw Creek on the left bank approximately 500 feet upstream of its confluence with the

Allegheny River. It flows south from its source approximately 4 miles north of the

Borough of Youngsville. The average stream gradient is approximately 90 feet per mile. Elevations in the main valley vary from a low of 1,150 feet to an average hilltop

elevation of 1,750 feet. The valley floor in the study area varies from 100 to 500 feet in

width (Reference 1).

Jackson Run, with a total drainage area of 24.8 square miles, has its source in the central

part of Warren County, near Chandlers Valley, Pennsylvania. It flows approximately

13.5 miles in a southeastern direction through Warren County to its confluence with Conewango Creek near the City of Warren. The area affecting the community extends

3.3 miles above its confluence with Conewango Creek. The average slope of Jackson

Run in the study area is 16.5 feet per mile. Local relief varies from a low of 1,185 feet to

an average hilltop elevation of 1,800 feet. The valley floor varies in width from 100 to 300 feet (Reference 2).

Matthews Run has a total drainage area of 16.4 square miles at its confluence with Brokenstraw Creek. It flows south from its source approximately six miles north of the

Township of Brokenstraw. The average stream gradient is approximately 58 feet per

mile. Local relief above the stream varies from a low of 1,210 feet to an average hilltop elevation of 1,800 feet. The valley floor in the study area varies from 100 to 500 feet in

width (References 1 and 9).

North Branch Akeley Run, with a drainage area of 10.0 square miles at its confluence with Conewango Creek, has its source near Cable Hollow, Pennsylvania, in the

northeastern portion of Warren County. It flows through Warren County for a distance of

4.9 miles to its confluence with Conewango Creek north of the City of Russell. The average slope of North Branch Akeley Run in the study area is 70.0 feet per mile. Local

relief varies from a low of 1,220 feet to an average hilltop elevation of 1,600 feet. The

valley floor varies in width from 100 feet to 300 feet (Reference 5).

8

Stillwater Creek, with a total drainage area of 17.1 square miles at its mouth, joins

Conewango Creek at mile 19.0, in Frewsburg, New York. It flows towards the northeast from its source in the Township of Sugar Grove near the Pennsylvania state line. The

average stream gradient is approximately 23 feet per mile. Elevations in the main valley

vary from a low of 1,230 feet to 1,770 feet at the extreme headwaters. The average

bedslope is approximately 40 feet per mile within the County. Local relief above the stream varies from a low of 1,380 feet to an average hilltop elevation of 1,500 feet. The

valley floor varies from 100 to 300 feet in width (Reference 7).

Tributary No. 1 to Stillwater Creek, with a total drainage area of 1.4 square miles at its

mouth, joins Stillwater Creek on the left bank approximately 2.4 miles downstream of the

corporate limits of the Borough of Sugar Grove. It flows towards the southeast from its source approximately one mile north of the Borough of Sugar Grove. The average

stream gradient is approximately 76 feet per mile. Elevations in the main valley vary

from 1,350 feet to 1,500 feet at the extreme headwaters. The average bedslope within the

borough is 67 feet per mile. Local relief above the stream varies from a low of 1,360 feet to an average hilltop elevation of 1,500 feet. The valley floor varies from 100 to 1,000

feet in width (Reference 7).

Tributary No. 2 to Stillwater Creek, with a total drainage area of approximately 2.1

square miles at its mouth, joins Stillwater Creek on the left bank approximately 3,200 feet

upstream of the corporate limits of the Borough of Sugar Grove. It flows towards the southeast from its source approximately two miles northeast of the Borough of Sugar

Grove. The average stream gradient is approximately 100 feet per mile. Elevations in

the main valley vary from 1,400 feet to 1,750 feet at the extreme headwaters. The average bedslope within the borough is approximately 60 feet per mile. Local relief

above the stream varies from a low of approximately 1,400 feet to an average hilltop

elevation of 1,500 feet. The valley floor varies from 50 to 100 feet in width (Reference 7).

Tributary No. 3 to Stillwater Creek, with a total drainage area of approximately 0.92

square miles at its mouth, joins Stillwater Creek on the right bank approximately 4,000 feet upstream of the corporate limits of the Borough of Sugar Grove. It flows towards the

north from its source approximately two miles south of the Borough of Sugar Grove. The

average stream gradient is approximately 220 feet per mile. Elevations in the main valley vary from 1,410 feet to 1,850 feet at the extreme headwaters. The average bedslope

within the borough is approximately 100 feet per mile. Local relief above the stream

varies from a low of approximately 1,410 feet to an average hilltop elevation of 1,500

feet. The valley floor varies from 50 to 100 feet in width (Reference 7).

The following flooding sources were studied by approximate methods: Billies Run,

Allegheny Reservoir, upper Glade Run, Hatch Run, Hemlock Run, Indian Hollow Run, Page Hollow Run, and Simons Hollow Run. Approximate analyses were used to study

those areas having a low development potential or minimal flood hazards.

2.3 Principal Flood Problems

Major floods have occurred along the Allegheny River at various times of the year;

however, the principal flood season is usually December through April. Most of the

floods during this period are the result of heavy rain and snowmelt. It is possible for large floods with a duration of several days to occur at any time of the year. Although

9

summer floods are rare on the Allegheny River, the flood of June 1972 was of

considerable magnitude in spite of the reduction by the upstream flood control of the Kinzua Dam and Allegheny Reservoir. The maximum flood of record along the

Allegheny River in Warren County occurred in March 1865. The highest recent flood

occurred in March 1956 and reached a gage height of 18.3 feet as measured at the

USACE gaging station number 0302550 at the City of Warren, Pennsylvania at river mile 188.70. If the upstream reservoir system had not been in place, the June 1972 flood

would have been 9.3 feet higher than recorded, or 1.4 feet higher than the March 1865

flood.

Table 4, “Historical Floods on the Allegheny River”, shows 12 major floods of record as

measured at the USACE gaging station number 0302550 at river mile 188.70.

Table 4 – Historical Floods on the Allegheny River

Date of Crest

Actual Stage*

(Ft)

Elevation

(Ft NAVD88)

Discharge

(cfs)

March 17, 1865 19.4 1,187.9 90,000 March 8, 1956 18.3 1,186.8 80,500

March 27, 1913 17.2 1,185.7 72,000

March 22, 1948 17.1 1,185.6 71,500 April 5, 1947 17.0 1,185.5 70,500

January 22, 1959 16.5 1,185.0 66,000

May 22, 1894 16.0 1,184.5 62,500 March 30, 1916 16.0 1,184.5 62,500

March 28, 1936 15.9 1,184.4 61,600

March 2, 1902 15.8 1,184.3 61,000

March 13, 1920 15.8 1,184.3 61,000 December 1, 1927 15.6 1,184.1 59,400

*Does not reflect reduction from Kinzua Dam Gage Zero Elevation = 1,168.54 feet NAVD88

The maximum flood of record on Brokenstraw Creek within the Borough of Youngsville

occurred on March 25, 1913, with a discharge of approximately 18,300 cubic feet per second (cfs), as measured at the USGS gaging station number 03015500 at the Borough

of Youngsville. This flood reached an approximate height of 1,201.1 feet at the gaging

station.

Table 5, “Historical Floods on Brokenstraw Creek,” shows five major floods of record as

measured at the USGS gaging station number 03015500 in the Borough of Youngsville, at mile 3.9.

10

Table 5 – Historical Floods on Brokenstraw Creek

Date of Crest

Stage

(Ft)

Elevation

(Ft NAVD88)

Discharge

(cfs)

March 25, 1913 14.20 1,200.60 18,300

April 5, 1947 12.85 1,199.27 15,300 March 22, 1948 12.66 1,199.08 15,000

January 22, 1959 12.51 1,198.93 14,600

June 24, 1928 12.75 1,199.17 13,800 Gage heights are adjusted to present zero datum Gage Zero Elevation = 1,186.42 feet NAVD88

Most of the floods, on Conewango Creek, from December through April are the result of heavy rain and snow-melt. The maximum flood of record occurred in April 1947 and

was the result of snowmelt and heavy rain. The March 1936 flood was the highest known

historical flood prior to the period of record.

Table 6, “Historical Floods on Conewango Creek,” shows nine major floods of record as

measured USGS Gaging Station No. 03015000 at Russell, Pennsylvania, since 1940.

Table 6 – Historical Floods on Conewango Creek

Gage Zero Elevation = 1,221.27 feet NAVD88

Akeley Run, Glade Run, Jackson Run and North Branch Akeley Run are more

susceptible to flash flooding from high intensity, short duration thunderstorms than from prolonged winter-spring rains combined with snowmelt.

The main flood season on Stillwater Creek and Tributary Nos. 1, 2, and 3 to Stillwater Creek, is in the summer months and are usually the result of high-intensity, short duration

storms. Floods on Stillwater Creek occurring in the winter months are usually the result

of heavy rainfall and snowmelt.

Date of Crest

Stage

(Ft)

Elevation

(Ft NAVD88)

Discharge

(cfs)

March 27-30, 1936 10.90 1,232.17 14,600

April 7, 1947 10.69 1,231.96 14,400

March 19, 1942 10.68 1,231.95 13,700

March 9, 1956 10.55 1,231.82 14,100 February 22, 1981 10.30 1,231.57 13,300

February 23, 1976 10.04 1,231.31 12,500

April 4, 1940 9.44 1,230.71 10,700 April 2, 1960 9.39 1,230.66 11,000

March 23, 1948 9.30 1,230.57 10,700

11

2.4 Flood Protection Measures

There is one upstream flood control dam and reservoir in the Allegheny River Basin, the Allegheny Reservoir and Kinzua Dam, located 16 miles upstream of the downstream City

of Warren corporate limits. This dam is effective in reducing flood levels by 4 to 9 feet.

The Allegheny Reservoir and Kinzua Dam project in the Allegheny River Basin was

placed in operation in January 1967 and has a drainage area of 2,180 square miles. Kinzua Dam controls 98 percent of the drainage area of the Allegheny River, upstream of

the confluence of Conewango Creek.

The Soil Conservation Service (SCS) has planned 20 floodwater retarding dams in the

extreme headwaters of Conewango Creek. However, they do not cause any reduction in

flow on Conewango Creek.

A local flood protection levee and channelization project was built in the mid-1960s on

Glade Run by the Commonwealth of Pennsylvania, Department of Environmental

Protection (PADEP) (formerly known as the Department of Environmental Resources) for the City of Warren and part of the Township of Glade. The project consists of a

concrete channel and earth dikes, and it extends from the mouth of Glade Run to

approximately 4,600 feet upstream through the City of Warren and part of the Township of Glade. The 1- and 5-percent-annual-chance floods are retained within the banks

throughout the project and meets FEMA requirements. The project begins 832 feet

upstream of the Park Avenue Bridge with a trapezoidal earth channel and right bank dike that continues downstream 3,375 feet to a weir and transition to a supercritical 28-foot

wide concrete rectangular channel. From here to the mouth, the concrete channel

remains steep and terminates in a stilling basin and baffles approximately 600 feet

downstream of the Pennsylvania Avenue Bridge.

A levee exists along the Allegheny River within the City of Warren at the Warren

Bypass. This levee provides protection against the 1-percent-annual-chance flood, but may be overtopped by greater flood events.

There are no flood control structures or local flood protection projects on Akeley Run,

Brokenstraw Creek, Irvine Run, Jackson Run, Matthews Run, and North Branch Akeley Run.

3.0 ENGINEERING METHODS

For the flooding sources studied by detailed methods in the community, standard hydrologic and

hydraulic study methods were used to determine the flood hazard data required for this study. Flood events of a magnitude that are expected to be equaled or exceeded once on the average

during any 10-, 50-, 100-, or 500-year period (recurrence interval) have been selected as having

special significance for floodplain management and for flood insurance rates. These events,

commonly termed the 10-, 50-, 100-, and 500-year floods, have a 10-, 2-, 1-, and 0.2-percent-annual-chance, respectively, of being equaled or exceeded during any year. Although the

recurrence interval represents the long-term, average period between floods of a specific

magnitude, rare floods could occur at short intervals or even within the same year. The risk of experiencing a rare flood increases when periods greater than 1 year are considered. For

example, the risk of having a flood that equals or exceeds the 1-percent-annual-chance (100-year)

12

flood in any 50-year period is approximately 40 percent (4 in 10); for any 90-year period, the risk

increases to approximately 60 percent (6 in 10). The analyses reported herein reflect flooding potentials based on conditions existing in the community at the time of completion of this study.

Maps and flood elevations will be amended periodically to reflect future changes.

3.1 Hydrologic Analyses

Hydrologic analyses were carried out to establish the peak discharge-frequency

relationships for the flooding source studied in detail affecting the community.

Pre-countywide Analyses

Natural discharge-frequency curves on the Allegheny River were developed following the Standard log-Pearson Type III analysis as outlined by USGS Bulletin 17B (Reference

13). The stage discharge records used in the analysis of the Allegheny River were

obtained from the USACE gaging station at Warren, Pennsylvania, covering a 100-year

period. The USACE has maintained a stream flow recording gage on the Allegheny River at the City of Warren since May 1966. Prior to that date, gage heights were obtained at a

non-recording gage operated by the U.S. Weather Bureau. Flood flow frequencies were

developed at the gaging station and were modified by means of an average reduction curve to reflect reduction by the upstream flood control reservoir. Natural discharge-

frequency curves on Brokenstraw Creek were developed following the standard log-

Pearson Type III analysis outlined by USGS Bulletin 17B (Reference 13). The stage discharge records used in this analysis were obtained at the USGS gaging station No.

03015500 at Youngsville, Pennsylvania. A drainage area-discharge (CSM) relationship

was established for the Brokenstraw Creek basin. Natural discharge-frequency curves on

Conewango Creek were developed following the standard log-Pearson Type III analysis as outlined by USGS Bulletin 17B (Reference 13). The stage discharge record used in

the analysis of Conewango Creek were obtained from the USGS gaging station No.

03015000 at Russell, Pennsylvania, covering a 44-year period, from 1940 through 1983. The gage at Russell is operated by the USGS in cooperation with the USACE.

There are no gage or stream flow records available for Akeley Run, Glade Run, North

Branch Akeley Run, and Jackson Run. Flows for the 10-, 2-, 1-, and 0.2-percent-annual-chance floods were developed using the multiple regression formulas based on factors

determined from a USACE study of small streams in Pennsylvania (Reference 14). The

factors used were drainage area, stream length, stream slope, and basin shape (References 2, 3, and 5).

Although studied by detailed methods, there are no stream gage or flow records for Indian Camp Run, Irvine Run, Matthews Run, Stillwater Creek, or Tributary Nos. 1, 2

and 3 to Stillwater Creek. Flows for the 1-percent-annual-chance flood were developed

using average values of the multiple regression formulas based on factors determined

from a USACE study of small streams in Pennsylvania and Federal Highway Administration Circular No. 17 (References 14 and 15). Flows for Indian Camp Run,

Irvine Run, and Matthews Run were then compared with the Brokenstraw Creek CSM to

verify their reasonableness and/or compatibility (References 1 and 9).

Peak discharge-drainage area relationships for the 10-, 2-, 1-, and 0.2-percent-annual-

chance floods for each stream studied by detailed methods are presented in Table 7, “Summary of Discharges.”

13

Table 7 – Summary of Discharges

FLOODING SOURCE

AND LOCATION

DRAINAGE

AREA

(SQ. MILES)

PEAK DISCHARGES (cubic feet per second)

10%-

ANNUAL-

CHANCE

2%-

ANNUAL-

CHANCE

1%-

ANNUAL-

CHANCE

0.2%-

ANNUAL-

CHANCE

AKELEY RUN

At confluence with

Conewango Creek

19.0 2,190 3,800 4,800 7,200

ALLEGHENY RIVER

Approximate 1,000 feet upstream of the

confluence of

Hedgehog Run

3,511* ** ** 53,100 **

Just upstream of U.S.

Route 62

3,327 34,100 39,300 41,200 48,200

Upstream of the

confluence of Brokenstraw Creek

3,173* ** ** 41,200 **

At confluence of

Unnamed Tributary to Allegheny River

3,136 33,800 38,800 40,600 47,300

Downstream of

confluence of Conewango Creek

3,131 33,500 38,300 40,000 46,500

Upstream of confluence

of Conewango Creek

2,231 25,500 25,700 25,800 26,200

BROKENSTRAW CREEK

At its confluence with

Allegheny River

338.0 ** ** 18,900 **

Just downstream of the

Grand Army of The

Republic Highway

bridge

324.6 ** ** 18,900 **

Upstream of its

confluence of

Matthews Run

04.6 ** ** 18,300 **

Upstream of the

confluence of Mead

Run

304.0 ** ** 17,800 **

*Includes drainage area controlled by upstream reservoir ** Data Not Available

14

Table 7 – Summary of Discharges (Continued)

FLOODING SOURCE

AND LOCATION

DRAINAGE

AREA

(SQ. MILES)


10%-

ANNUAL-

CHANCE

2%-

ANNUAL-

CHANCE

1%-

ANNUAL-

CHANCE

0.2%-

ANNUAL-

CHANCE

CONEWANGO

CREEK

At confluence with

Allegheny River

898.0 12,600 16,100 17,600 21,000

At confluence of Jackson Run

816.0 12,000 15,300 16,800 20,000

Just upstream of

confluence with

Jackson Run

766.0 11,600 14,800 16,300 19,400

GLADE RUN

At confluence with Allegheny River

6.6 1,190 2,080 2,610 4,030

INDIAN CAMP RUN At confluence with

Brokenstraw Creek

2.5 * * 1,370 *

IRVINE RUN At confluence with

Brokenstraw Creek

9.2 * * 2,800 *

Upstream of the confluence of

Unnamed Tributary

to Irvine Run

4.9 * * 1,950 *

JACKSON RUN

At confluence with

Conewango Creek

24.8 2,750 4,690 5,820 9,090

MATTHEWS RUN

At confluence with

Brokenstraw Creek

16.4 * * 3,730 *

Approximately 0.48

mile upstream of

Highland Avenue

15.1 * * 3,730 *

Upstream of the confluence of

Browns Run

13.3 * * 3,580 *

Upstream of the confluence of Telick

Run

5.4 * * 1,980 *

* Data Not Available

15

Table 7 – Summary of Discharges (Continued)

FLOODING SOURCE

AND LOCATION

DRAINAGE

AREA

(SQ. MILES)


10%-

ANNUAL-

CHANCE

2%-

ANNUAL-

CHANCE

1%-

ANNUAL-

CHANCE

0.2%-

ANNUAL-

CHANCE

NORTH BRANCH

AKELEY RUN At confluence with

Conewango Creek

10.0 1,500 2,600 3,300 5,100

STILLWATER CREEK

Approximately 0.22

mile downstream of

School Road

8.3 * * 2,640 *

Upstream of the

confluence of

Tributary No. 2 to Stillwater Creek

5.9 * * 2,290 *

Upstream of the

confluence of Tributary No. 3 to

Stillwater Creek

5.0 * * 2,020 *

TRIBUTARY NO. 1 TO STILLWATER

CREEK

Approximately 0.53 mile downstream

Jamestown Road

1.0 * * 850 *

TRIBUTARY NO. 2 TO STILLWATER

CREEK

At confluence with

Stillwater Creek

2.1 * * 1,210 *

TRIBUTARY NO. 3

TO STILLWATER CREEK

At confluence with

Stillwater Creek 0.9 * * 800 *

*Data not available

16

Countywide Analyses

No new hydrologic analyses were conducted for detailed studied streams. For all

approximately studied streams, Pennsylvania region III USGS regression equations were

used to estimate flood flows for the 1-percent-annual-chance recurrence interval.

Equations were developed utilizing peak flow data from 322 gaging stations within Pennsylvania and surrounding states. The equation for region III, in which Warren

County lies, uses 4 parameters to estimate discharge; drainage area (as determined from

30 meter digital elevation model), mean basin elevation, percent carbonate bedrock, and percent storage.

3.2 Hydraulic Analyses

Analyses of the hydraulic characteristics of flooding from the sources studied were

carried out to provide estimates of the elevations of floods of the selected recurrence

intervals. Users should be aware that flood elevations shown on the FIRM represent

rounded whole foot elevations and may not exactly reflect the elevations shown on the Flood Profiles or in the Floodway Data tables in the FIS report. Flood elevations shown

on the FIRM are primarily intended for flood insurance rating purposes. For construction

and/or floodplain management purposes, users are cautioned to use the flood elevation data presented in this FIS in conjunction with the data shown on the FIRM.

Flood profiles were drawn showing computed water-surface elevations to an accuracy of 0.5-foot for floods of the selected recurrence intervals. Locations of selected cross

sections used in the hydraulic analyses are shown on the Flood Profiles (Exhibit 1). For

stream segments for which a floodway is computed (Section 4.2), selected cross-section

locations are also shown on the FIRM (Exhibit 2).

Unless specified otherwise, the hydraulic analyses for these studies were based on

unobstructed flow. The flood elevations shown on the profiles are thus considered valid only if hydraulic structures remain unobstructed, operate properly, and do not fail.

All elevations shown on the Flood Profiles and FIRM (Exhibits 1 and 2) are referenced to

the North American Vertical Datum of 1988 (NAVD 88).

Pre-countywide Analyses

Water-surface elevations for Akeley Run, Allegheny River, Brokenstraw Creek,

Conewango Creek, Indian Camp Run, Matthews Run, North Branch Akeley Run, and

Stillwater Creek of the selected recurrence intervals were computed using the USACE HEC-2 step-backwater computer program (Reference 16).

Starting water-surface elevations for Akeley Run and North Branch Akeley Run were

obtained from a rating curve on Conewango Creek located approximately at mile 7.65. The final frequency profiles were determined by combining the effects of flooding from

Conewango Creek and Akeley and North Branch Akeley Runs, which were assumed to

be independent.

Flood profiles were drawn showing computed water-surface elevations for floods of the

selected recurrence intervals for Allegheny River and Conewango Creek.

17

Starting water-surface elevations for the Allegheny River were based on stage-discharge

relationships at the downstream corporate limits of the Township of Brokenstraw. These were obtained by a continuation of profile computations that started at the confluence of

the Allegheny River with the Ohio River in Pittsburgh, Pennsylvania, and high-water

marks.

The starting water-surface elevation for Brokenstraw Creek was obtained by a

continuation of profile computations started at critical depth at its confluence with the

Allegheny River.

Starting water-surface elevations for Conewango Creek (within the Township of

Conewango) were based on a continuation of profiles obtained from the FIS for the City of Warren (Reference 8).

Starting water-surface elevations for Conewango Creek were based on coincidental

flooding with the regulated discharge from Kinzua Dam on the Allegheny River.

The starting elevations for the 10-, 2-, 1-, and 0.2-percent-annual-chance theoretical

floods on Conewango Creek are determined by the amount of flow released from Kinzua Dam at the time of the flood crest on Conewango Creek. These are controlled releases,

not natural flows. Bank-full release flow of 25,000 cfs is made from Kinzua Dam after

Conewango Creek has crested. The bank-full release could be made after any flood and could be the same for a 10-percent-annual-chance flood as well as 1-percent-annual-

chance flood. Because the levee and channelization project is supercritical, starting

water-surface elevations for Glade Run at its mouth are meaningless. The analysis was

started at critical depth at mile 0.276. The final profiles from mile 0.0 to 0.148 were developed by combined frequency of the backwater with the Allegheny River regulated

outflow by Kinzua Dam. The HEC-2 coding of the levee and channelization project

from mile 0.0 to 0.865 was developed by the use of "as-built" PADEP drawings. Note that throughout this project (mile 0.0 to 0.865), the frequency flood discharges are

contained within the channel; therefore, no encroachment run is needed up to mile 0.865.

Upstream of mile 0.865, the project ends and the cross sections were digitized from aerial

photographs, while bridge sections were field surveyed.

The starting water-surface elevations for Indian Camp Run, Irvine Run, Jackson Run, and

Matthews Run were obtained by assuming critical depth.

The starting water-surface elevation for Stillwater Creek was estimated using the

slope/area method. The starting water-surface elevation for Tributary No. 1 to Stillwater Creek was assumed to be at critical depth. The starting water-surface elevation for

Tributary Nos. 2 and 3 to Stillwater Creek were obtained from the cross sections on

Stillwater Creek located at the mouth of each tributary. This procedure accounts for any

backwater effect from the main channel on the tributaries. Flood profiles were drawn showing computed water-surface elevations for floods of the selected recurrence

intervals. The results of the water-surface computations are tabulated for the selected

cross sections for each stream segment.

Cross-section data for the Allegheny River, Brokenstraw Creek, Indian Camp Run, Irvine

Run, Matthews Run, Stillwater Creek, and Tributaries No. 1-3 to Stillwater Creek, were obtained by field surveys.

18

Cross-section data for Akeley Run, Conewango Creek, Glade Run, Jackson Run, and

North Branch Akeley Run, were obtained from topographic maps compiled from aerial photographs taken in February 1984 at a scale of 1:4,800, with a contour interval of four

feet (Reference 17).

All bridges, dams, and culverts in Warren County were field surveyed to obtain elevation data and structural geometry.

Channel and overbank roughness factors (Manning’s “n”) used in the hydraulic computations were estimated by engineering judgment and based on field observation at

each cross-section and adjusted with known high-water marks and stream gage rating

curves where possible (References 16). Table 8, “Manning’s “n” Values,” shows the channel and overbank “n” values for the streams studied by detailed methods.

Table 8 – Manning’s “n” Value Table

STREAM CHANNEL OVERBANK

Akeley Run 0.035 - 0.040 0.070 - 0.080

Allegheny River 0.025 - 0.040 0.040 - 0.090

Brokenstraw Creek 0.045 0.060 - 0.080

Conewango Creek 0.024 - 0.047 0.060 - 0.080

Glade Run 0.014 - 0.035 0.030 - 0.070

Indian Camp Run 0.040 0.080

Irvine Run 0.045 0.080

Jackson Run 0.040 0.090

Matthews Run 0.040 0.080

North Branch Akeley Run 0.030 - 0.035 0.070 - 0.080

Stillwater Creek 0.080 0.080

Tributary No. 1 to Stillwater Creek 0.080 0.080

Tributary No. 2 to Stillwater Creek 0.080 0.080

Tributary No. 3 to Stillwater Creek 0.035 - 0.040 0.080

Countywide Analyses

No new detailed hydraulic analyses were conducted. For all streams studied by

approximate methods, water surface profiles were computed using HEC-RAS steady state simulation. HEC-RAS applies a peak discharge at each cross section to determine a

maximum water surface elevation. The elevations are calculated using the standard step

method and the energy, continuity, and Manning equations. A subcritical flow regime was assumed for all reaches. Manning’s n-values were derived based on land use data

obtained from Pennsylvania Spatial Data Access (PASDA).

Qualifying bench marks within a given jurisdiction are cataloged by the National Geodetic Survey (NGS) and entered into the National Spatial Reference System (NSRS).

First or Second Order Vertical bench marks that have a vertical stability classification of

A, B, or C are shown and labeled on the FIRM with their 6 character NSRS Permanent Identifier.

19

Bench marks cataloged by the NGS and entered into the NSRS vary widely in vertical stability classification. NSRS vertical stability classifications are as follows:

Stability A: Monuments of the most reliable nature, expected to hold position/elevation

well (e.g., mounted in bedrock)

Stability B: Monuments which generally hold their position/elevation well (e.g., concrete

bridge abutments)

Stability C: Monuments which may be affected by surface ground movements (e.g.,

concrete mounted below frost line)

Stability D: Mark of questionable or unknown vertical stability (e.g., concrete monument

above frost line, or steel witness post)

In addition to NSRS bench marks, the FIRM may also show vertical control monument

established by a local jurisdiction; these monuments will be shown on the FIRM with the

appropriate designations. Local monuments will only be placed on the FIRM if the community has requested that they be included, and if the monuments meet the

aforementioned NSRS inclusion criteria.

To obtain current elevation, description and/or location information for bench marks

shown on the FIRM for this jurisdiction, please contact the Information Services Branch

of the NGS at (301) 713-3242, or visit their Web site, www.ngs.noaa.gov.

It is important to note that temporary vertical monuments are often established during the

preparation of a flood hazard analysis for the purposes of establishing local vertical

control. Although these monuments are not shown on the digital FIRM, they may be found in the Technical Support Data Notebook associated with this FIS and FIRM.

Interested individuals may contact FEMA to access this data.

3.3 Vertical Datum

All FIS reports and FIRMs are referenced to a specific vertical datum. The vertical

datum provides a starting point against which flood, ground, and structure elevations can be referenced and compared. Until recently, the standard vertical datum used for newly

created or revised FIS reports and FIRMs was the National Geodetic Vertical Datum of

1929 (NGVD). With the completion of the North American Vertical Datum of 1988 (NAVD), many FIS reports and FIRMs are now prepared using NAVD as the referenced

vertical datum.

Flood elevations shown in this FIS report and on the FIRM are referenced to the NAVD. These flood elevations must be compared to structure and ground elevations referenced to

the same vertical datum.

Some of the data used in this revision were taken from the prior effective FIS reports and

FIRMs and adjusted to NAVD. The datum conversion factor from NGVD to NAVD in

Warren County is -0.500 feet. The data points used to determine the conversion are listed in Table 9, “Vertical Datum Conversion Values.”

20

Table 9 – Vertical Datum Conversion Values

Quad Name Corner Longitude Latitude

Conversion from

NGVD to NAVD

Cherry Grove SE 41.625 -79.125 -0.486

Clarendon SE 41.750 -79.000 -0.463

Clymer SE 42.000 -79.625 -0.466

Cobham SE 41.625 -79.250 -0.545

Columbus SE 41.875 -79.500 -0.505

Cornplanter Run SE 41.875 -78.875 -0.472

Corry SE 41.875 -79.625 -0.486

Grand Valley SE 41.625 -79.500 -0.502

Ivory SE 42.000 -79.000 -0.502

Jamestown SE 42.000 -79.125 -0.525

Lakewood SE 42.000 -79.250 -0.486

Lottsville SE 41.875 -79.375 -0.528

North Clymer SE 42.000 -79.500 -0.449

Panama SE 42.000 -79.375 -0.489

Pittsfield SE 41.750 -79.375 -0.505

Russell SE 41.875 -79.125 -0.538

Scandia SE 41.875 -79.000 -0.528

Sheffield SE 41.625 -79.000 -0.440

Spatansburg SE 41.750 -79.625 -0.489

Spring Creek SE 41.750 -79.500 -0.515

Steambug SE 42.000 -78.875 -0.489

Sugar Grove SE 41.875 -79.250 -0.509

Tidioute SE 41.625 -79.375 -0.558

Titusville North SE 41.625 -79.625 -0.525

Warren SE 41.750 -79.125 -0.482

Youngsville SE 41.750 -79.250 -0.459

AVERAGE -0.500 feet

NGVD - 0.5 = NAVD

The BFEs shown on the FIRM represent whole-foot rounded values. For example, a

BFE of 102.4 will appear as 102 on the FIRM and 102.6 will appear as 103. Therefore, users that wish to convert the elevations in this FIS to NGVD 29 should apply the

conversion factor to elevations shown on the Flood Profiles and supporting data tables in

this FIS report, which are shown at a minimum to the nearest 0.1 foot.

21

For additional information regarding conversion between the NGVD and NAVD, visit

the National Geodetic Survey website at http://www.ngs.noaa.gov, or contact the National Geodetic Survey at the following address:

NGS Information Services

NOAA, N/NGS12 National Geodetic Survey, SSMC-3, #9202

1315 East-West Highway

Silver Spring, Maryland 20910-3282 (301) 713-3242

Temporary vertical monuments are often established during the preparation of a flood hazard analysis for the purpose of establishing local vertical control. Although these

monuments are not shown on the FIRM, they may be found in the Technical Support

Data Notebook associated with the FIS report and FIRM for this community. Interested

individuals may contact FEMA to access these data.

To obtain current elevation, description, and/or location information for benchmarks

shown on this map, please contact the Information Services Branch of the NGS at (301) 713-3242, or visit their website at http://www.ngs.noaa.gov.

4.0 FLOODPLAIN MANAGEMENT APPLICATIONS

The NFIP encourages State and local governments to adopt sound floodplain management

programs. Therefore, each FIS provides 1-percent-annual-chance (100-year) flood elevations and

delineations of the 1- and 0.2-percent-annual-chance (500-year) floodplain boundaries and 1-

percent-annual-chance floodway to assist communities in developing floodplain management measures. This information is presented on the FIRM and in many components of the FIS report,

including Flood Profiles and Floodway Data Table. Users should reference the data presented in

the FIS report as well as additional information that may be available at the local map repository before making flood elevation and/or floodplain boundary determinations.

4.1 Floodplain Boundaries

To provide a national standard without regional discrimination, the 1-percent-annual-chance flood has been adopted by FEMA as the base flood for floodplain management

purposes. The 0.2-percent-annual-chance flood is employed to indicate additional areas

of flood risk in the community. For each stream studied by detailed methods, the 1- and 0.2-percent-annual-chance floodplain boundaries have been delineated using the flood

elevations determined at each cross section.

LiDAR technology was used as the terrain data source for both redelineation of detailed

and approximate floodplains in this study. This hi-resolution terrain data allows for more

accuracy in floodplain mapping. The data was collected under the PAMAP program for

several counties in Pennsylvania in the Spring 2007.

The 1- and 0.2-percent-annual-chance floodplain boundaries are shown on the FIRM

(Exhibit 2). On this map, the 1-percent-annual-chance floodplain boundary corresponds to the boundary of the areas of special flood hazards (Zones A and AE), and the 0.2-

percent-annual-chance floodplain boundary corresponds to the boundary of areas of

22

moderate flood hazards. In cases where the 1- and 0.2-percent-annual-chance floodplain

boundaries are close together, only the 1-percent-annual-chance floodplain boundary has been shown. Small areas within the floodplain boundaries may lie above the flood

elevations but cannot be shown due to limitations of the map scale and/or lack of detailed

topographic data.

For streams studied by approximate methods, only the 1-percent-annual-chance

floodplain boundary is shown on the FIRM (Exhibit2).

4.2 Floodways

Encroachment on floodplains, such as structures and fill, reduces flood-carrying capacity,

increases flood heights and velocities, and increases flood hazards in areas beyond the encroachment itself. One aspect of floodplain management involves balancing the

economic gain from floodplain development against the resulting increase in flood

hazard. For purposes of the NFIP, a floodway is used as a tool to assist local

communities in this aspect of floodplain management. Under this concept, the area of the 1-percent-annual-chance floodplain is divided into a floodway and a floodway fringe.

The floodway is the channel of a stream, plus any adjacent floodplain areas, that must be

kept free of encroachment so that the 1-percent-annual-chance flood can be carried without substantial increases in flood heights. Minimum Federal standards limit such

increases to 1 foot, provided that hazardous velocities are not produced. The floodways

in this study are presented to local agencies as minimum standards that can be adopted directly or that can be used as a basis for additional floodway studies.

The floodways presented in this FIS report and on the FIRM were computed for certain

stream segments on the basis of equal-conveyance reduction from each side of the floodplain. Floodway widths were computed at cross sections. Between cross sections,

the floodway boundaries were interpolated. The results of the floodway computations

have been tabulated for selected cross sections (Table 10, Floodway Data). The computed floodways are shown on the FIRM (Exhibit 2). In cases where the floodway

and 1-percent-annual-chance floodplain boundaries are either close together or collinear,

only the floodway boundary has been shown.

Encroachment into areas subject to inundation by floodwaters having hazardous velocities

aggravates the risk of flood damage, and heightens potential flood hazards by further

increasing velocities. A listing of stream velocities at selected cross sections is provided in Table 6, “Floodway Data.” In order to reduce the risk of property damage in areas where

the stream velocities are high, the community may wish to restrict development to areas

outside the floodways.

No floodways were computed for Brokenstraw Creek, Indian Camp Run, Irvine Run,

Matthews Run, Stillwater Creek, Tributary No. 1 to Stillwater Creek, Tributary No. 2 to

Stillwater Creek and Tributary No. 3 to Stillwater Creek. Floodways were not computed

for portions of Allegheny River.

Near the mouths of streams studied in detail, floodway computations are made without

regard to flood elevations on the receiving water body. Therefore, “Without Floodway”

elevations presented in Table 10 for certain downstream cross sections of Akeley Run,

Conewango Creek, and North Branch Akeley Run are lower than the regulatory flood

23

elevations in that area, which must take into account the 1-percent-annual-chance

flooding due to backwater from other sources.

The area between the floodway and 1-percent-annual-chance floodplain boundaries is

termed the floodway fringe. The floodway fringe encompasses the portion of the floodplain that could be completely obstructed without increasing the Water Surface

Elevation (WSEL) of the 1-percent-annual-chance flood more than 1-foot at any point.

Typical relationships between the floodway and the floodway fringe and their

significance to floodplain development are shown in Figure 1, “Floodway Schematic”.

Figure 1 - Floodway Schematic

24

Table 10 – Floodway Data

FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD

WATER SURFACE ELEVATION

CROSS SECTION DISTANCE WIDTH (FEET)

SECTION AREA

(SQUARE FEET)

MEAN VELOCITY (FEET PER SECOND)

REGULATORY (FEET NAVD88)

WITHOUT FLOODWAY

(FEET NAVD88)

WITH FLOODWAY

(FEET NAVD88)

INCREASE (FEET)

AKELEY RUN

A 2551

400 1,174 4.1 1,228.03 1,226.6

1,227.4 0.8

B 2,1251 117 470 10.2 1,246.3 1,246.3 1,246.9 0.6

C 3,4891 149 545 8.8 1,256.1 1,256.1 1,256.1 0.0

D 5,4991 78 382 12.6 1,278.9 1,278.9 1,279.7 0.8

E 7,3391 139 449 7.9 1,299.1 1,299.1 1,299.2 0.1

F 8,3601 97 351 10.1 1,311.5 1,311.5 1,311.5 0.0

G 9,8151 69 361 9.8 1,330.9 1,330.9 1,331.7 0.8

H 11,1851 179 525 6.7 1,351.2 1,351.2 1,351.5 0.3

ALLEGHENY RIVER

A 940,1042 * * * 1,145.9 * * *

B 945,3842 * * * 1,149.5 * * *

C 950,7702

* * * 1,153.1 * * *

D 953,4102 * * * 1,154.4 * * *

E 955,6802 * * * 1,156.0 * * *

F 959,1652 * * * 1,157.9 * * *

G 959,4292 545 7,172 5.7 1,157.9 1,157.9 1,158.9 1.0

H 959,4822 537 7,107 5.8 1,157.9 1,157.9 1,158.9 1.0

I 959,5342 545 7,096 5.8 1,158.0 1,158.0 1,159.0 1.0

J 965,1842 1,438 9,100 4.5 1,161.2 1,161.2 1,161.7 0.5

1 Feet above confluence with Conewango Creek

3 Elevation computed using 1% annual chance discharges from Conewango Creek

2 Feet above confluence with Ohio River * No floodway data computed

TA

BL

E 1

0

FEDERAL EMERGENCY MANAGEMENT AGENCY

WARREN COUNTY, PA (ALL JURISDICTIONS)

FLOODWAY DATA

AKELEY RUN AND ALLEGHENY RIVER

25



CROSS SECTION DISTANCE1

WIDTH (FEET)

SECTION AREA

(SQUARE FEET)



WITHOUT FLOODWAY

(FEET NAVD88)

WITH FLOODWAY

(FEET NAVD88)

INCREASE (FEET)

ALLEGHENY RIVER (Continued)

K 972,048 510 6,946 5.9 1,167.0 1,167.0 1,167.3 0.3

L 977,011 1,263 12,787 3.2 1,170.0 1,170.0 1,170.2 0.2

M 982,397 467 4,951 8.2 1,172.2 1,172.2 1,172.3 0.1

N 986,937 474 6,708 6.1 1,176.7 1,176.7 1,176.8 0.1

O 990,264 501 6,728 5.9 1,178.5 1,178.5 1,178.8 0.3

P 992,904 465 6,745 5.9 1,180.1 1,180.1 1,180.3 0.2

Q 995,649 501 9,129 4.4 1,181.3 1,181.3 1,182.0 0.7

R 998,184 604 6,166 4.2 1,181.8 1,181.8 1,182.0 0.2

S 1,002,408 668 5,237 4.9 1,183.6 1,183.6 1,183.7 0.1

T 1,008,585 687 3,814 6.7 1,186.8 1,186.8 1,186.8 0.0

U 1,011,278 536 4,733 5.4 1,189.1 1,189.1 1,189.3 0.2

V 1,018,512 814 5,395 4.8 1,194.2 1,194.2 1,194.3 0.1

W 1,021,522 400 4,487 5.7 1,195.8 1,195.8 1,195.9 0.1

X 1,024,531 761 4,544 5.7 1,197.7 1,197.7 1,197.7 0.0

Y 1,033,403 430 4,658 5.4 1,204.2 1,204.2 1,204.2 0.0

Z 1,038,682 542 4,643 5.4 1,206.9 1,206.9 1,207.0 0.1

1 Feet above confluence with Ohio River

TA

BL

E 1

0



FLOODWAY DATA

ALLEGHENY RIVER

26




WIDTH (FEET)

SECTION AREA

(SQUARE FEET)



WITHOUT FLOODWAY

(FEET NAVD88)

WITH FLOODWAY

(FEET NAVD88)

INCREASE (FEET)

CONEWANGO CREEK

A 1,610 203 2,062 8.5 1,182.4 1,181.72

1,181.7 0.0

B 2,202 385 4,819 3.7 1,184.5 1,184.62 1,184.7 0.1

C 3,147 335 2,915 6.0 1,185.2 1,184.52 1,184.6 0.1

D 4,916 445 2,827 6.2 1,186.2 1,185.72 1,185.8 0.1

E 7,587 251 2,638 6.7 1,189.7 1,189.7 1,190.4 0.7

F 9,958 210 1,725 10.2 1,191.1 1,191.1 1,191.6 0.5

G 10,565 420 3,055 5.8 1,193.3 1,193.3 1,193.9 0.6

H 13,015 495 3,496 4.8 1,195.8 1,195.8 1,196.5 0.7

I 15,729 254 1,853 9.1 1,197.5 1,197.5 1,198.2 0.7

J 18,432 527 2,900 5.8 1,200.8 1,200.8 1,201.2 0.4

K 21,474 510 2,412 7.0 1,203.7 1,203.7 1,203.8 0.1

L 21,944 418 2,527 6.6 1,204.5 1,204.5 1,204.5 0.0

M 24,251 403 2,552 6.6 1,209.9 1,209.9 1,209.9 0.0

N 27,028 608 4,479 3.8 1,211.6 1,211.6 1,212.0 0.4

O 28,163 327 2,018 8.3 1,211.7 1,211.7 1,211.7 0.0

P 33,898 238 2,510 6.7 1,219.0 1,219.0 1,219.6 0.6

Q 36,696 352 3,002 5.6 1,223.0 1,223.0 1,223.5 0.5

R 38,702 236 1,792 9.4 1,225.3 1,225.3 1,225.4 0.1

S 44,473 294 2,970 5.7 1,235.5 1,235.5 1,236.1 0.6

T 47,309 204 3,870 4.2 1,237.8 1,237.8 1,238.6 0.8

1 Feet above confluence with Allegheny River

2 Elevation computed without consideration of coincident peak flooding with Allegheny River

TA

BL

E 1

0



FLOODWAY DATA

CONEWANGO CREEK

27




WIDTH (FEET)

SECTION AREA

(SQUARE FEET)



WITHOUT FLOODWAY

(FEET NAVD88)

WITH FLOODWAY

(FEET NAVD88)

INCREASE (FEET)

CONEWANGO CREEK (Continued)

U 52,826 433 4,717 3.5 1,239.9 1,239.9 1,240.9 1.0

V 55,340 507 5,417 3.0 1,240.8 1,240.8 1,241.8 1.0

W 58,196 617 6,389 2.6 1,241.7 1,241.7 1,242.7 1.0

X 64,601 2271 20,487 0.8 1,242.4 1,242.4 1,243.4 1.0

Y 67,267 2851 27,659 0.6 1,242.6 1,242.6 1,243.6 1.0

GLADE RUN

A 5,490

50 193 10.7 1,245.9 1,245.9 1,246.0 0.1

B 6,212 39 220 9.4 1,261.2 1,261.2 1,261.4 0.2

C 6,892 40 173 11.9 1,272.7 1,272.7 1,272.7 0.0

D 9,062 51 188 10.9 1,316.6 1,316.6 1,316.6 0.0

E 11,081 74 213 9.7 1,351.4 1,351.4 1,351.4 0.0

F 11,776 83 221 9.3 1,362.6 1,362.6 1,362.6 0.0

G 12,046 46 122 9.2 1,370.5 1,370.5 1,370.5 0.0

H 13,406 26 100 11.2 1,419.0 1,419.0 1,419.0 0.0

I 14,210 64 135 8.3 1,439.1 1,439.1 1,439.1 0.0

J 14,705 70 139 8.1 1,455.0 1,455.0 1,455.0 0.0

1 Feet above confluence with Allegheny River

TA

BL

E 1

0



FLOODWAY DATA

CONEWANGO CREEK AND GLADE RUN

28




WIDTH (FEET)

SECTION AREA

(SQUARE FEET)



WITHOUT FLOODWAY

(FEET NAVD88)

WITH FLOODWAY

(FEET NAVD88)

INCREASE (FEET)

JACKSON RUN

A 980 467 2,465 2.4 1,204.0 1,204.0 1,204.7 0.7

B 2,320 462 1,576 3.7 1,206.6 1,206.6 1,206.8 0.2

C 3,920 104 807 7.2 1,211.4 1,211.4 1,212.4 1.0

D 5,410 88 546 10.7 1,217.0 1,217.0 1,217.9 0.9

E 6,740 180 654 8.9 1,225.6 1,225.6 1,225.9 0.3

F 8,240 285 2,606 2.2 1,236.9 1,236.9 1,237.8 0.9

G 10,350 172 817 7.1 1,245.6 1,245.6 1,246.6 1.0

H 11,760 153 712 8.2 1,255.2 1,255.2 1,255.7 0.5

I 13,180 132 576 10.1 1,261.6 1,261.6 1,262.4 0.8

J 14,980 224 1,365 4.3 1,276.4 1,276.4 1,277.4 1.0

K 17,150 179 978 6.0 1,288.1 1,288.1 1,289.1 1.0


TA

BL

E 1

0



FLOODWAY DATA

JACKSON RUN

29




WIDTH (FEET)

SECTION AREA

(SQUARE FEET)



WITHOUT FLOODWAY

(FEET NAVD88)

WITH FLOODWAY

(FEET NAVD88)

INCREASE (FEET)

NORTH BRANCH AKELEY RUN

A 250 243 592 5.6 1,228.8 1,227.82 1,228.6 0.8

B 2,055 250 595 5.5 1,245.8 1,245.8 1,246.0 0.2

C 2,950 164 526 6.3 1,249.0 1,249.0 1,249.4 0.4

D 4,825 66 280 11.8 1,269.7 1,269.7 1,270.2 0.5

E 6,935 61 286 11.5 1,293.8 1,293.8 1,294.5 0.7

F 8,680 78 297 11.1 1,318.3 1,318.3 1,318.5 0.2

G 12,060 110 395 8.4 1,359.2 1,359.2 1,359.3 0.1

H 14,830 64 278 11.9 1,395.6 1,395.6 1,395.6 0.0

I 16,970 52 295 11.2 1,422.8 1,422.8 1,423.8 1.0

J 19,170 79 267 10.5 1,450.5 1,450.5 1,450.8 0.3

K 20,400 63 259 10.8 1,461.8 1,461.8 1,462.2 0.4

L 22,110 49 164 10.5 1,485.5 1,485.5 1,485.5 0.0

M 24,170 55 170 10.1 1,532.4 1,532.4 1,532.4 0.0


2 Elevation computed without consideration of backwater effects from Conewango Creek

TA

BL

E 1

0



FLOODWAY DATA

NORTH BRANCH AKELEY RUN

30

5.0 INSURANCE APPLICATIONS

Zone A

Zone A is the flood insurance rate zone that corresponds to the 1-percent-annual-chance

floodplains that are determined in the FIS report by approximate methods. Because detailed

hydraulic analyses are not performed for such areas, no base (1-percent-annual-chance) flood elevations (BFEs) or depths are shown within this zone.

Zone AE

Zone AE is the flood insurance rate zone that corresponds to the 1-percent-annual-chance

floodplains that are determined in the FIS report by detailed methods. Whole foot BFEs derived from the detailed hydraulic analyses are shown at selected intervals within this zone.

Zone AH

Zone AH is the flood insurance rate zone that corresponds to areas of 1-percent-annual-chance

shallow flooding (usually areas of ponding) where average depths are between 1 and 3 feet.

Whole foot BFEs derived from the detailed hydraulic analyses are shown at selected intervals within this zone.

Zone AO

Zone AO is the flood insurance rate zone that corresponds to areas of 1-percent-annual-chance

shallow flooding (usually sheet flow on sloping terrain) where average depths are between 1 and

3 feet. Average whole-foot depths derived from the detailed hydraulic analyses are shown within this zone.

Zone AR

Zone AR is the flood insurance risk zone that corresponds to an area of special flood hazard

formerly protected from the base flood event by a flood-control system that was subsequently

decertified. Zone AR indicates that the former flood-control system is being restored to provide protection from the 1-percent-annual-chance or greater flood event.

Zone A99

Zone A99 is the flood insurance rate zone that corresponds to areas of the

1-percent-annual-chance floodplain that will be protected by a Federal flood protection system where construction has reached specified statutory milestones. No BFEs or depths are shown

within this zone.

Zone V

Zone V is the flood insurance rate zone that corresponds to the 1-percent-annual-chance coastal

floodplains that have additional hazards associated with storm waves. Because approximate hydraulic analyses are performed for such areas, no BFEs are shown within this zone.

31

Zone VE

Zone VE is the flood insurance rate zone that corresponds to the 1-percent-annual-chance coastal

floodplains that have additional hazards associated with storm waves. Whole foot BFEs derived

from the detailed hydraulic analyses are shown at selected intervals within this zone.

Zone X

Zone X is the flood insurance rate zone that corresponds to areas outside the 0.2-percent-annual-chance floodplain, areas within the 0.2-percent-annual-chance floodplain,

areas of 1-percent-annual-chance flooding where average depths are less than 1 foot, areas of

1-percent-annual-chance flooding where the contributing drainage area is less than 1 square mile (sq. mi.), and areas protected from the base flood by levees. No BFEs or depths are shown within

this zone.

Zone X (Future Base Flood)

Zone X (Future Base Flood) is the flood insurance risk zone that corresponds to the

1-percent-annual-chance floodplains that are determined based on future-conditions hydrology. No BFEs or base flood depths are shown within this zone.

Zone D

Zone D is the flood insurance rate zone that corresponds to unstudied areas where flood hazards

are undetermined, but possible.

6.0 FLOOD INSURANCE RATE MAP

The FIRM is designed for flood insurance and floodplain management applications.

For flood insurance applications, the map designates flood insurance risk zones as described in

Section 5.0 and, in the 1-percent-annual-chance floodplains that were studied by detailed

methods, shows selected whole-foot BFEs or average depths. Insurance agents use the zones and

BFEs in conjunction with information on structures and their contents to assign premium rates for flood insurance policies.

For floodplain management applications, the map shows by tints, screens, and symbols, the 1- and 0.2-percent-annual-chance floodplains, floodways, and the locations of selected cross

sections used in the hydraulic analyses and floodway computations.

The countywide FIRM presents flooding information for the geographic area of Warren County.

Previously, FIRMs were prepared for each incorporated community of the County identified as

flood-prone. This countywide FIRM also includes flood hazard information that was presented

separately on Flood Boundary and Floodway Maps (FBFMs), where applicable. Historical data relating to the maps prepared for each community are presented in Table 11, “Community Map

History.”

32

Table 19 – Community Map History

COMMUNITY NAME

INITIAL IDENTIFICATION

FLOOD HAZARD BOUNDARY MAP REVISIONS DATE

FIRM EFFECTIVE DATE

FIRM REVISIONS DATE

Bear Lake, Borough of None None None

Brokenstraw, Township of December 20, 1974 October 1, 1976

September 2, 1977 March 18, 1991

Cherry Grove, Township of None None None

Clarendon, Borough of September 6, 1974 May 21, 1976 April 17, 1985

Columbus, Township of January 17, 1975 August 15, 1980 December 1, 19861

Conewango, Township of December 27, 1974 February 22, 1980 August 19, 1987 April 16, 1990

Deerfield, Township of November 15, 1974 January 27, 1978

May 9, 1980 April 1, 1987

1

Eldred, Township of January 17, 1975 None May 15, 1985

Elk, Township of January 10, 1975 None June 30, 1976

Farmington, Township of April 8, 1977 None May 15, 1985

Freehold, Township of January 24, 1975 None August 5, 1985

Glade, Township of April 4, 1975 February 13, 1981 September 4, 1987

Limestone, Township of December 27, 1974 None June 1, 19871

Mead, Township of December 20, 1974 None November 4, 1988

1 Converted by letter

TA

BL

E 1

1



COMMUNITY MAP HISTORY

33

COMMUNITY NAME

INITIAL IDENTIFICATION

FLOOD HAZARD BOUNDARY MAP REVISIONS DATE

FIRM EFFECTIVE DATE

FIRM REVISIONS DATE

Pine Grove, Township of January 24, 1975 None August 19, 1987

Pittsfield, Township of November 8, 1974 April 10, 1981 August 1, 19871

Pleasant, Township of January 17, 1975 August 29, 1980 January 5, 1989

Sheffield, Township of November 22, 1974 None December 1, 19861

Southwest, Township of November 22, 1974 None May 15, 1985

Spring Creek, Township of March 19, 1976 None September 1, 19871

Sugar Grove, Borough of May 31, 1974 May 28, 1976 August 15, 1990

Sugar Grove, Township of January 24, 1975 None February 15, 1985

Tidioute, Borough of July 11, 1975 None February 15, 1985

Triumph, Township of January 17, 1975 None February 15, 1985

Warren, City of May 31, 1974 June 4, 1976

December 4, 1981 August 19, 1987

Watson, Township of January 10, 1975 January 16, 1981 May 1, 1985

Youngsville, Borough of April 12, 1974 July 9, 1976

January 22, 1982 August 15, 1990

1 Converted by letter

TA

BL

E 1

1



COMMUNITY MAP HISTORY

34

7.0 OTHER STUDIES

FISs have been prepared for the following communities: Town of South Valley, Cattaraugus County, New York, the Towns of Busti, Carroll, Clymer, French Creek, Harmony, and Kiantone,

Chautauqua County, New York; and Crawford, Erie, Forest, McKean, and Venango Counties,

Pennsylvania (References 18-25).

Information pertaining to revised and unrevised flood hazards for each jurisdiction within Warren

County has been compiled into this FIS. Therefore, this FIS supersedes all previously printed FIS

reports, FIRMs, and/or FBFMs for all of the incorporated and unincorporated jurisdictions within Warren County

8.0 LOCATION OF DATA

Information concerning the pertinent data used in preparation of this study can be obtained by contacting FEMA, Federal Insurance and Mitigation Division, One Independence Mall, Sixth

Floor, 615 Chestnut Street, Philadelphia, Pennsylvania 19106-4404.

9.0 BIBLIOGRAPHY AND REFERENCES

1. Federal Emergency Management Agency, Flood Insurance Study, Township of

Brokenstraw, Warren County, Pennsylvania, Washington, D.C., March 18, 1991.

2. Federal Emergency Management Agency, Flood Insurance Study, Township of

Conewango, Warren County, Pennsylvania, Washington, D.C., Initial: August 19, 1987,

Revised: April 16, 1990.

3. Federal Emergency Management Agency, Flood Insurance Study, Township of Glade,

Warren County, Pennsylvania, Washington, D.C., September 4, 1987.

4. Federal Emergency Management Agency, Flood Insurance Study, Township of Mead,

Warren County, Pennsylvania, Washington, D.C., November 4, 1988.

5. Federal Emergency Management Agency, Flood Insurance Study, Township of Pine

Grove, Warren County, Pennsylvania, Washington, D.C., August 19, 1987.

6. Federal Emergency Management Agency, Flood Insurance Study, Township of Pleasant, Warren County, Pennsylvania, Washington, D.C., January 5, 1989.

7. Federal Emergency Management Agency, Flood Insurance Study, Borough of Sugar Grove, Warren County, Pennsylvania, Washington, D.C., August 15, 1990.

8. Federal Emergency Management Agency, Flood Insurance Study, Borough of Warren, Warren County, Pennsylvania, Washington, D.C., August 19, 1987.

9. Federal Emergency Management Agency, Flood Insurance Study, Borough of

Youngsville, Warren County, Pennsylvania, Washington, D.C., August 15, 1990.

35

10. U.S. Census Bureau, 2009 estimate: Warren County, Pennsylvania. Retrieved May 17,

2010 from http://www.factfinder.census.gov.

11. U.S. Census Bureau, 2000 Census: Warren County, Pennsylvania. Retrieved November

21, 2006 from http://www.factfinder.census.gov.

12. The Weather Channel, Monthly Averages for Warren County, Pennsylvania. Retrieved

May 4, 2007 from http://www.weather.com.

13. U.S. Army Corps of Engineers, Pittsburgh District, "Untitled Regression Data,"

Pittsburgh, Pennsylvania, 1975.

14. Federal Highway Administration, Hydraulic Engineering Circular No. 17, The Design of Encroachments on Flood Plains Using Risk Analysis, Washington, D. C., October 1980.

15. U.S. Department of the Interior, Geological Survey, Office of Water Data Collection,

Interagency Advisory Committee on Water Data, "Guidelines for Determining Flood Flow Frequency," Bulletin 17B, Reston, Virginia, Revised September 1981.

16. U.S. Army Corps of Engineers, Hydrologic Engineering Center, HEC-2 Water Surface

Profiles, Generalized Computer Program, Davis, California, October 1973, with updates.

17. Robert Kimball and Associates of Ebensberg, Pennsylvania, Topographic maps compiled from aerial photographs taken in February 1984, Scale 1:4,800, Contour

Interval 4 Feet: Conewango, Pennsylvania, February 1984.

18. Federal Emergency Management Agency, Flood Insurance Study, Town of South Valley, Cattaraugus County, New York, Washington, D.C., December 2, 1983.

19. Federal Emergency Management Agency, Flood Insurance Study, Town of Busti,

Chautauqua County, New York, Washington, D.C., January 20, 1993.

20. Federal Emergency Management Agency, Flood Insurance Study, Town of Carroll,

Chautauqua County, New York, Washington, D.C., October, 29 1982.

21. Federal Emergency Management Agency, Flood Insurance Study, Town of Clymer,

Chautauqua County, New York, Washington, D.C., October 7, 1983.

22. Federal Emergency Management Agency, Flood Insurance Study, Town of French

Creek, Chautauqua County, New York, Washington, D.C., June 8, 1984.

23. Federal Emergency Management Agency, Flood Insurance Rate Map, Town of Harmony, Chautauqua County, New York, Washington, D.C., December 1, 1986.

24. Federal Emergency Management Agency, Flood Insurance Study, Town of Kiantone,

Chautauqua County, New York, Washington, D.C., February 2, 1996.

25. Federal Emergency Management Agency, Flood Insurance Study, Crawford County, (All Jurisdictions), Pennsylvania, Washington, D.C., study underway.

26. Federal Emergency Management Agency, Flood Insurance Study, Erie, County, (All

Jurisdictions), Pennsylvania, Washington, D.C., study underway.

36

27. Federal Emergency Management Agency, Flood Insurance Study, Forest, County, (All


28. Federal Emergency Management Agency, Flood Insurance Study, McKean, County, (All


29. Federal Emergency Management Agency, Flood Insurance Study, Venango County, (All


1210

1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

1290 1290

1300 1300

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CONEWANGO CREEK

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

AK

ELE

Y R

UN

01P

A B C

D

CO

NFL

UEN

CE W

ITH

CO

NR

AIL

BIG

FO

UR

RO

AD

LEGEND

0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD



STREAM BED

CROSS SECTION LOCATION

CO

NEW

AN

GO

CR

EEK

FLOODING CONTROLLED BY CONEWANGO CREEK

1270

1280

1290 1290

1300 1300

1310 1310

1320 1320

1330 1330

1340 1340

1350 1350

1360 1360

6500 7000 7500 8000 8500 9000 9500 10000 10500 11000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

AK

ELE

Y R

UN

02P

E F G

HU

NG

RY

HO

LLO

W R

OA

D

LEGEND





STREAM BED


CO

NFLU

EN

CE O

FM

IDD

LEFI

ELD

RU

N

1330

1340

1350 1350

1360 1360

1370 1370

1380 1380

1390 1390

1400 1400

1410 1410

1420 1420

11000 11500 12000 12500 13000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

AK

ELE

Y R

UN

03P

H

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

PR

IES

T H

OLL

OW

RO

AD

LEGEND





STREAM BED


(L.R

. 6

10

50

)

1115

1120

1125 1125

1130 1130

1135 1135

1140 1140

1145 1145

1150 1150

1155 1155

1160 1160

934500 935000 935500 936000 936500 937000 937500 938000 938500 939000 939500 940000 940500 941000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH OHIO RIVER

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

04P

A

LEGEND





STREAM BED


LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

1120

1125

1130 1130

1135 1135

1140 1140

1145 1145

1150 1150

1155 1155

1160 1160

1165 1165

941000 941500 942000 942500 943000 943500 944000 944500 945000 945500 946000 946500 947000 947500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

05P

B

LEGEND





STREAM BED


1120

1125

1130 1130

1135 1135

1140 1140

1145 1145

1150 1150

1155 1155

1160 1160

1165 1165

947500 948000 948500 949000 949500 950000 950500 951000 951500 952000 952500 953000 953500 954000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

06P

C

D

LEGEND





STREAM BED


1125

1130

1135 1135

1140 1140

1145 1145

1150 1150

1155 1155

1160 1160

1165 1165

1170 1170

954000 954500 955000 955500 956000 956500 957000 957500 958000 958500 959000 959500 960000 960500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

07P

E

F G

H

I

U.S

. R

OU

TE 6

2 (

HIG

H-L

EV

EL)

LEGEND





STREAM BED


CO

NFLU

EN

CE O

F B

RO

KEN

ST

RA

W C

REEK

CO

NFL

UEN

CE O

F LE

NH

AR

T R

UN

1130

1135

1140 1140

1145 1145

1150 1150

1155 1155

1160 1160

1165 1165

1170 1170

1175 1175

960500 961000 961500 962000 962500 963000 963500 964000 964500 965000 965500 966000 966500 967000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

08P

J

LEGEND





STREAM BED


1140

1145

1150 1150

1155 1155

1160 1160

1165 1165

1170 1170

1175 1175

1180 1180

1185 1185

967000 967500 968000 968500 969000 969500 970000 970500 971000 971500 972000 972500 973000 973500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

09P

K

LEGEND





STREAM BED


1140

1145

1150 1150

1155 1155

1160 1160

1165 1165

1170 1170

1175 1175

1180 1180

1185 1185

973500 974000 974500 975000 975500 976000 976500 977000 977500 978000 978500 979000 979500 980000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

10P

L

LEGEND





STREAM BED


1140

1145

1150 1150

1155 1155

1160 1160

1165 1165

1170 1170

1175 1175

1180 1180

1185 1185

980000 980500 981000 981500 982000 982500 983000 983500 984000 984500 985000 985500 986000 986500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

11P

M

LEGEND





STREAM BED


1145

1150

1155 1155

1160 1160

1165 1165

1170 1170

1175 1175

1180 1180

1185 1185

1190 1190

986500 987000 987500 988000 988500 989000 989500 990000 990500 991000 991500 992000 992500 993000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

12P

N O

P

WA

RR

EN

BY

-PA

SS

RA

ILR

OA

D

LEGEND





STREAM BED


T.O.R. = 1193.54

L.C. = 1188.4

1150

1155

1160 1160

1165 1165

1170 1170

1175 1175

1180 1180

1185 1185

1190 1190

1195 1195

993000 993500 994000 994500 995000 995500 996000 996500 997000 997500 998000 998500 999000 999500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

13P

Q

R

CO

NFLU

EN

CE O

F C

ON

EW

AN

GO

CR

EEK

HIC

KO

RY

ST

REET

RA

ILR

OA

D

LEGEND





STREAM BED


T.O.R = 1204.5

1155

1160

1165 1165

1170 1170

1175 1175

1180 1180

1185 1185

1190 1190

1195 1195

1200 1200

999500 1000000 1000500 1001000 1001500 1002000 1002500 1003000 1003500 1004000 1004500 1005000 1005500 1006000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

14P

S

CO

NFL

UEN

CE O

F G

LAD

E R

UN

LEGEND





STREAM BED


1160

1165

1170 1170

1175 1175

1180 1180

1185 1185

1190 1190

1195 1195

1200 1200

1205 1205

1006000 1006500 1007000 1007500 1008000 1008500 1009000 1009500 1010000 1010500 1011000 1011500 1012000 1012500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

15P

T

U

PEN

NS

YLV

AN

IA A

VEN

UE

LEGEND





STREAM BED


ST

AT

E R

OU

TE 6

CO

NFLU

EN

CE O

F B

RO

WN

S R

UN

NOTE: THE 2% ANNUAL CHANCE FLOOD PROFILE IS TOO CLOSE TO THE1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY

1165

1170

1175 1175

1180 1180

1185 1185

1190 1190

1195 1195

1200 1200

1205 1205

1210 1210

1012500 1013000 1013500 1014000 1014500 1015000 1015500 1016000 1016500 1017000 1017500 1018000 1018500 1019000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

16P

V

LEGEND





STREAM BED


1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELYNOTE: THE 0.2 AND 2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE

1170

1175

1180 1180

1185 1185

1190 1190

1195 1195

1200 1200

1205 1205

1210 1210

1215 1215

1019000 1019500 1020000 1020500 1021000 1021500 1022000 1022500 1023000 1023500 1024000 1024500 1025000 1025500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

17P

W

X

LEGEND





STREAM BED


CO

NFLU

EN

CE O

F W

AR

D R

UN

1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELYNOTE: THE 0.2 AND 2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE

1170

1175

1180 1180

1185 1185

1190 1190

1195 1195

1200 1200

1205 1205

1210 1210

1215 1215

1025500 1026000 1026500 1027000 1027500 1028000 1028500 1029000 1029500 1030000 1030500 1031000 1031500 1032000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

18P

LEGEND





STREAM BED


CO

NFL

UEN

CE O

F H

EM

LOC

K R

UN

NOTE: THE 0.2 AND 2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY

1170

1175

1180 1180

1185 1185

1190 1190

1195 1195

1200 1200

1205 1205

1210 1210

1215 1215

1032000 1032500 1033000 1033500 1034000 1034500 1035000 1035500 1036000 1036500 1037000 1037500 1038000 1038500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

19P

Y

LEGEND





STREAM BED


1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELYNOTE: THE 0.2 AND 2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE NOTE: THE 0.2, 2, AND 10 % ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE

1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY

1170

1175

1180 1180

1185 1185

1190 1190

1195 1195

1200 1200

1205 1205

1210 1210

1215 1215

1038500 1039000 1039500 1040000 1040500 1041000 1041500 1042000 1042500 1043000 1043500 1044000 1044500 1045000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ALL

EG

HEN

Y R

IVER

20P

Z

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LEGEND





STREAM BED


NOTE: THE 0.2, 2, AND 10 % ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY

1110

1120

1130 1130

1140 1140

1150 1150

1160 1160

1170 1170

1180 1180

1190 1190

1200 1200

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ALLEGHENY RIVER

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

BR

OK

EN

ST

RA

W C

REEK

21P

A B

C

CO

NFL

UEN

CE W

ITH

CO

NFL

UEN

CE O

F IR

VIN

E R

UN

OLD

RO

UT

E 6

RA

ILR

OA

D

LEGEND





STREAM BED


ALL

EG

HEN

Y R

IVER

1% ANNUAL CHANCE BACKWATER FROM ALLEGHENY RIVER

1130

1140

1150 1150

1160 1160

1170 1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 11500 12000 12500 13000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

BR

OK

EN

ST

RA

W C

REEK

22P

D

BR

IDG

E

US

RO

UT

E 6

LEGEND





STREAM BED


CO

NFLU

EN

CE O

F M

CK

INN

EY

RU

N

1140

1150

1160 1160

1170 1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

13000 13500 14000 14500 15000 15500 16000 16500 17000 17500 18000 18500 19000 19500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

BR

OK

EN

ST

RA

W C

REEK

23P

E F

G

LEGEND





STREAM BED


1160

1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

19500 20000 20500 21000 21500 22000 22500 23000 23500 24000 24500 25000 25500 26000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

BR

OK

EN

ST

RA

W C

REEK

24P

H I J

K

CO

NFL

UEN

CE O

F IN

DIA

N C

AM

P R

UN

CO

NFL

UEN

CE O

F M

AT

TH

EW

S R

UN

EA

ST

MA

IN S

TR

EET

GR

AN

D A

RM

Y O

F T

HE R

EP

UB

LIC

HIG

HW

AY

RA

ILR

OA

D

LEGEND





STREAM BED


YO

UN

GS

VIL

LE B

Y P

AS

S/

U.S

. R

OU

TE 6

/ S

TA

TE R

OU

TE 2

7

CO

NFL

UEN

CE O

F M

EA

D R

UN

1170

1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

26000 26500 27000 27500 28000 28500 29000 29500 30000 30500 31000 31500 32000 32500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

BR

OK

EN

ST

RA

W C

REEK

25P

L M

LEGEND





STREAM BED


1190

1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

32500 33000 33500 34000 34500 35000 35500 36000 36500 37000 37500 38000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

BR

OK

EN

ST

RA

W C

REEK

26P

N O P

CO

UV

ER

S C

RO

SS

ING

RO

AD

LEGEND





STREAM BED


1190

1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

38000 38500 39000 39500 40000 40500 41000 41500 42000 42500 43000 43500 44000 44500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

BR

OK

EN

ST

RA

W C

REEK

27P

Q

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

AIR

PO

RT

RO

AD

LEGEND





STREAM BED


1140

1150

1160 1160

1170 1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

28P

A B C D

CO

NFL

UEN

CE W

ITH

PEN

NS

YLV

AN

IA A

VEN

UE E

AS

T

DA

M

EA

ST

TH

IRD

AV

EN

UE

EA

ST

FIF

TH

AV

EN

UE

LEGEND





STREAM BED


ALL

EG

HEN

Y R

IVER


1150

1160

1170 1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 11500 12000 12500 13000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

29P

E F G

CO

NFL

UEN

CE O

F J

AC

KS

ON

RU

N

LEGEND





STREAM BED


1160

1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

13000 13500 14000 14500 15000 15500 16000 16500 17000 17500 18000 18500 19000 19500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

30P

H I

J

LEGEND





STREAM BED


1170

1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

19500 20000 20500 21000 21500 22000 22500 23000 23500 24000 24500 25000 25500 26000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

31P

K L M

HA

TC

H R

UN

RO

AD

LEGEND





STREAM BED


(ST

AT

E H

OS

PIT

AL

BR

IDG

E)

1180

1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

26000 26500 27000 27500 28000 28500 29000 29500 30000 30500 31000 31500 32000 32500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

32P

N O

LEGEND





STREAM BED


1180

1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

32500 33000 33500 34000 34500 35000 35500 36000 36500 37000 37500 38000 38500 39000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

33P

P Q

R

RA

ILR

OA

D

LEGEND





STREAM BED


1190

1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

39000 39500 40000 40500 41000 41500 42000 42500 43000 43500 44000 44500 45000 45500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

34P

S

CO

NFL

UEN

CE O

F A

KELE

Y R

UN

CO

NF L

UEN

CE O

F N

OR

TH

BR

AN

CH

AK

ELE

Y R

UN

HU

NG

RY

HO

LLO

W R

OA

D

LEGEND





STREAM BED


1190

1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

45500 46000 46500 47000 47500 48000 48500 49000 49500 50000 50500 51000 51500 52000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

35P

T

LEGEND





STREAM BED


1190

1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

52000 52500 53000 53500 54000 54500 55000 55500 56000 56500 57000 57500 58000 58500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

36P

U V

W

OLD

RU

SS

EL

RO

AD

LEGEND





STREAM BED


1190

1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

58500 59000 59500 60000 60500 61000 61500 62000 62500 63000 63500 64000 64500 65000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

37P

X

LEGEND





STREAM BED


CO

NFLU

EN

CE O

F W

ILT

SIE

RU

N

CO

NFLU

EN

CE O

F S

TO

REH

OU

SE R

UN

1190

1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

65000 65500 66000 66500 67000 67500 68000 68500 69000 69500 70000 70500 71000 71500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

CO

NEW

AN

GO

CR

EEK

38P

Y

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LEGEND





STREAM BED


1170

1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

GLA

DE R

UN

39P

A

CO

NFLU

EN

CE W

ITH

ALL

EG

HEN

Y R

IVER

RA

ILR

OA

D B

RID

GE

CA

TW

ALK

MEA

D S

TR

EET

BR

IDG

E

CH

EC

K S

TR

UC

TU

RE

CH

EC

K S

TR

UC

TU

RE

UN

ITED

OIL

REFI

NER

Y B

RID

GE

UN

ITED

OIL

REFI

NER

Y B

RID

GE

PEN

NS

YLV

AN

IA A

VEN

UE E

AS

T

CO

BH

AM

PA

RK

AV

EN

UE

LEGEND





STREAM BED



(ST

AT

E R

OU

TE 6

)

(LR

61

03

7)

CULVERT

1245

1255

1265 1265

1275 1275

1285 1285

1295 1295

1305 1305

1315 1315

1325 1325

1335 1335

6000 6500 7000 7500 8000 8500 9000 9500 10000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

GLA

DE R

UN

40P

B C D

FR

IED

RIC

H D

RIV

E

AC

CES

S R

OA

D

LEGEND





STREAM BED


1320

1330

1340 1340

1350 1350

1360 1360

1370 1370

1380 1380

1390 1390

1400 1400

1410 1410

10000 10500 11000 11500 12000 12500 13000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

GLA

DE R

UN

41P

E F G

CO

SH

AM

PA

RK

AV

EN

UE

LEGEND





STREAM BED


(LR

61

03

7)

CULVERT

1390

1400

1410 1410

1420 1420

1430 1430

1440 1440

1450 1450

1460 1460

1470 1470

1480 1480

13000 13500 14000 14500 15000 15500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

GLA

DE R

UN

42P

H I J

AC

CES

S R

OA

D

LEGEND





STREAM BED


LIM

IT O

F S

TU

DY

1160

1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BROKENSTRAW CREEK

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

IND

IAN

CA

MP

RU

N

43P

A B C D E

CO

NFL

UEN

CE W

ITH

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

MIL

L S

TR

EET

HIG

HLA

ND

AV

EN

UE

LEGEND

0.2% ANNUAL CHANCE FLOOD*


2% ANNUAL CHANCE FLOOD*


STREAM BED


BR

OK

EN

ST

RA

W C

REEK

1% ANNUAL CHANCE BACKWATER FROM BROKENSTRAW CREEK

*DATA NOT AVAILABLE

1140

1150

1160 1160

1170 1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN FEET ABOVE MOUTH

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

IRV

INE R

UN

44P

A B C

D

CO

NFL

UEN

CE W

ITH

BR

OK

EN

ST

RA

W C

REEK

OLD

RO

UT

E 6

RA

ILR

OA

D

GR

AN

D A

RM

Y O

F T

HE

LEGEND





STREAM BED


REP

UB

LIC

HIG

HW

AY

*DATA NOT AVAILABLE

1200

1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

1290 1290

6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 11500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

IRV

INE R

UN

45P

E F G

IRV

INE R

UN

RO

AD

IRV

INE R

UN

RO

AD

LEGEND


STREAM BED





*DATA NOT AVAILABLE

1270

1280

1290 1290

1300 1300

1310 1310

1320 1320

1330 1330

1340 1340

1350 1350

1360 1360

11500 12000 12500 13000 13500 14000 14500 15000 15500 16000 16500 17000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

IRV

INE R

UN

46P

H I J

PR

IVA

TE R

OA

D

LEGEND


STREAM BED





*DATA NOT AVAILABLE

1350

1360

1370 1370

1380 1380

1390 1390

1400 1400

1410 1410

1420 1420

1430 1430

1440 1440

17000 17500 18000 18500 19000 19500 20000 20500 21000 21500 22000 22500 23000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

IRV

INE R

UN

47P

K

L

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LEGEND


STREAM BED


*DATA NOT AVAILABLE




1160

1170

1180 1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

JA

CK

SO

N R

UN

48P

A B C

D

CO

NFL

UEN

CE W

ITH

CO

NEW

AN

GO

CR

EEK

SO

UT

H S

TA

TE S

TR

EET

RA

ILR

OA

D

U.S

. R

OU

TE 6

2/M

AR

KET

ST

REET

AC

CES

S R

OA

D

AB

AN

DO

NED

BR

IDG

E

LEGEND





STREAM BED


1190

1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 11500 12000 12500 13000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

JA

CK

SO

N R

UN

49P

E F G

H

KIR

KW

OO

D C

HU

RC

H C

AM

P B

RID

GE

LEGEND





STREAM BED


1230

1240

1250 1250

1260 1260

1270 1270

1280 1280

1290 1290

1300 1300

1310 1310

1320 1320

13000 13500 14000 14500 15000 15500 16000 16500 17000 17500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

JA

CK

SO

N R

UN

50P

I J K

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

TR

AIL

ER

PA

RK

BR

IDG

E

LEGEND





STREAM BED


1170

1180

1190 1190

1200 1200

1210 1210

1220 1220

1230 1230

1240 1240

1250 1250

1260 1260

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

MA

TT

HEW

S R

UN

51P

A B C D

CO

NFL

UEN

CE W

ITH

HIG

HLA

ND

AV

EN

UE

LEGEND





STREAM BED


BR

OK

EN

ST

RA

W C

REEK

1% ANNUAL CHANCE BACKWATER FROM BROKENSTRAW CREEK

*DATA NOT AVAILABLE

1230

1240

1250 1250

1260 1260

1270 1270

1280 1280

1290 1290

1300 1300

1310 1310

1320 1320

6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 11500 12000 12500 13000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

MA

TT

HEW

S R

UN

52P

E F

G

CO

NFLU

EN

CE O

F B

RO

WN

S R

UN

PR

IVA

TE R

OA

D

LEGEND


STREAM BED





*DATA NOT AVAILABLE

CO

NFL

UEN

CE O

F L

AN

SIN

G R

UN

1300

1310

1320 1320

1330 1330

1340 1340

1350 1350

1360 1360

1370 1370

1380 1380

1390 1390

13000 13500 14000 14500 15000 15500 16000 16500 17000 17500 18000 18500 19000 19500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

MA

TT

HEW

S R

UN

53P

H I J

K

CO

NFL

UEN

CE O

F T

ELI

CK

RU

N

LEGEND


STREAM BED


*DATA NOT AVAILABLE




1350

1360

1370 1370

1380 1380

1390 1390

1400 1400

1410 1410

1420 1420

1430 1430

1440 1440

19500 20000 20500 21000 21500 22000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

MA

TT

HEW

S R

UN

54P

L

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LEGEND

STREAM BED


*DATA NOT AVAILABLE





1210

1220

1230 1230

1240 1240

1250 1250

1260 1260

1270 1270

1280 1280

1290 1290

1300 1300

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

NO

RT

H B

RA

NC

H A

KELE

Y R

UN

55P

A B C D

CO

NFL

UEN

CE W

ITH

RA

ILR

OA

D

HU

NG

RY

HO

LLO

W R

OA

D

LEGEND





STREAM BED


CO

NEW

AN

GO

CR

EEK

1% ANNUAL CHANCE BACKWATER FROM CONEWANGO CREEK

1280

1290

1300 1300

1310 1310

1320 1320

1330 1330

1340 1340

1350 1350

1360 1360

1370 1370

6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 11500 12000 12500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

NO

RT

H B

RA

NC

H A

KELE

Y R

UN

56P

E F

G

LEGEND





STREAM BED


1350

1360

1370 1370

1380 1380

1390 1390

1400 1400

1410 1410

1420 1420

1430 1430

1440 1440

12500 13000 13500 14000 14500 15000 15500 16000 16500 17000 17500 18000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

NO

RT

H B

RA

NC

H A

KELE

Y R

UN

57P

H I

LEGEND





STREAM BED


1430

1440

1450 1450

1460 1460

1470 1470

1480 1480

1490 1490

1500 1500

1510 1510

1520 1520

18000 18500 19000 19500 20000 20500 21000 21500 22000 22500 23000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

NO

RT

H B

RA

NC

H A

KELE

Y R

UN

58P

J K L

LEGEND





STREAM BED


1500

1510

1520 1520

1530 1530

1540 1540

1550 1550

1560 1560

1570 1570

1580 1580

1590 1590

23000 23500 24000 24500 25000 25500 26000 26500 27000 27500 28000 28500 29000 29500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

NO

RT

H B

RA

NC

H A

KELE

Y R

UN

59P

M

MIL

L R

OA

D

LEGEND





STREAM BED


LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

CULVERT

1350

1360

1370 1370

1380 1380

1390 1390

1400 1400

1410 1410

1420 1420

1430 1430

1440 1440

17500 18000 18500 19000 19500 20000 20500 21000 21500 22000 22500 23000 23500 24000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN FEET ABOVE NEW YORK STATE BOUNDARY

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

ST

ILLW

AT

ER

CR

EEK

60P

A B C D E F

G

CO

NFL

UEN

CE O

F T

RIB

UT

AR

Y

SC

HO

OL

ST

REET

MA

IN S

TR

EET

WES

T M

ILL

ST

REET

LEGEND





STREAM BED


*DATA NOT AVAILABLE

NO

. 2

TO

ST

ILLW

AT

ER

CR

EEK

CO

NFL

UEN

CE O

F T

RIB

UT

AR

YN

O. 3

TO

ST

ILLW

AT

ER

CR

EEK

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

1350

1360

1370 1370

1380 1380

1390 1390

1400 1400

1410 1410

1420 1420

1430 1430

1440 1440

4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 9000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH STILLWATER CREEK

FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

TR

IBU

TA

RY

NO

. 1

TO

ST

ILLW

AT

ER

CR

EEK

61P

A B C D

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

JA

MES

TO

WN

ST

REET

FOR

ES

T S

TR

EET

LEGEND





STREAM BED


ST

AT

E R

OU

TE 6

9

*DATA NOT AVAILABLE

1390

1400

1410 1410

1420 1420

1430 1430

1440 1440

1450 1450

1460 1460

1470 1470

1480 1480

9000 9500 10000 10500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

TR

IBU

TA

RY

NO

. 1

TO

ST

ILLW

AT

ER

CR

EEK

62P

E F

LIM

IT O

F S

TU

DY

LEGEND


STREAM BED


*DATA NOT AVAILABLE




1380

1390

1400 1400

1410 1410

1420 1420

1430 1430

1440 1440

1450 1450

1460 1460

1470 1470

0 500 1000 1500 2000 2500 3000

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

TR

IBU

TA

RY

NO

. 2

TO

ST

ILLW

AT

ER

CR

EEK

63P

A B C

CO

NFL

UEN

CE W

ITH

ST

ILLW

AT

ER

CR

EEK

LIM

IT O

F D

ET

AIL

ED

ST

UD

Y

EA

ST

MIL

L S

TR

EET

LEGEND





STREAM BED


CULVERT

*DATA NOT AVAILABLE

1390

1400

1410 1410

1420 1420

1430 1430

1440 1440

1450 1450

1460 1460

1470 1470

1480 1480

0 500 1000 1500 2000 2500

ELE

VA

TIO

N IN

FEET

(N

AV

D 8

8)


FED

ER

AL

EM

ER

GEN

CY

MA

NA

GEM

EN

T A

GEN

CY

WA

RR

EN

CO

UN

TY

, P

A(A

LL J

UR

ISD

ICT

ION

S)

FLO

OD

PR

OFIL

ES

TR

IBU

TA

RY

NO

. 3

TO

ST

ILLW

AT

ER

CR

EEK

64P

A B C

CO

NFL

UEN

CE W

ITH

ST

ILLW

AT

ER

CR

EEK

LIM

IT O

F S

TU

DY

ST

AT

E R

OU

TE 9

57

LEGEND





STREAM BED


CULVERT

*DATA NOT AVAILABLE

WARREN COUNTY, PENNSYLVANIA - rampp€¦ · warren county, pennsylvania (all jurisdictions)...

Documents

Transcript of WARREN COUNTY, PENNSYLVANIA - rampp€¦ · warren county, pennsylvania (all jurisdictions)...