,

J

. phone: (785) 296-3717 109 SW 9th Street, 2nd Floor Department ofAgriculture fax: (785) 296-1176 Topeka, Kansas 66612-1283 Division of Water Resources www.ksda.gov/dwr

Dale A. Rodman, Secretary Sam Brownback, Governor .

David W. Barfield, Chief Engineer

January 23, 2012

Danny Mathews, City Clerk City of Council Grove 205 Union Street P.O. Box 313

Council Grove, KS 66846

RE: Dam Safety Inspection DMR-0033 (Council Grove City Lake Dam)

Dear Dam Owner:

Acting under the authority ofK.S.A. 82a-30I through 305a, the Obstructions in Streams Act, the Division of Water Resources (DWR) inspected your dam on March 2 and May 5, 2011. Your dam is located in the NW Y. of the SE Y. of the NW Y. of Section 8, Township 16 South, Range 8 East in Morris County, Kansas.

In conjunction with the safety inspectiOI�, a hazard class evaluation was also completed. The dam has been identified as a class "c" high hazard structure. As per K.A.R. 5-40-20, this is because the reservoir is a water supply for the City of Council Grove and because of the possible inundation of Canning Creek Cove Recreational Area. In order to meet the requireI1;lents of K.S.A. 82a-303b, you will be required to have a safety inspection conducted by a licensed qualified engineer once every three years. This inspection meets those requirements. As of the date of this letter, you will be responsible for all future safety inspections unless otherwise notified by the DWR. The next safety inspection for this dam will need to be conducted between May 1,2014 and April 30, 2015.

Additionally, state regulations (K.A.R. 5-40-73) require owners of class "c" dams to create and maintain an emergency action plan (EAP) that meets the requirements of the "Federal Guidelines for Dam Safety: Emergency Action Planning for Dam Owners" also known as "FEMA 64". You will have 180 days from the date of this letter to submit the EAP to the Chief Engineer.

We have made recommendations for the maintenance and monitoring of the dam in the attached report. We urge you to implement these recommendations. Please be aware that ongoing maintenance is necessary for the dam to function as designed. If conditions worsen, these recommendations may be required by the Chief Engineer at a later date.

Responsibility for a dam's safety rests solely with the owner of the dam. Any construction or improvements to a dam that is subject to the provisions ofK.S.A. 82a-30I to 305a, without prior written consent or permit by the ChiefEngineer, shall be considered a violation.

Thank you for your cooperation in addressing the safety of your dam. Should you have any questions, please feel free to contact me at 785-296-2940 or Kimberly Feldkamp at (785) 296-4625.

Sincerely,

SCANNED

Ambrose 1.Ketter, P.E. Water Structures Engineer

pc: Morris County Emergency Management

ambrose.ketter@kda.ks.gov

Dam Safety Inspection Report City of Council Grove

Council Grove City Lake Dam WSN: DMR-0033 NID: KS02512-

Inspection Date: March 2 & May 5, 2011

Report Prepared by: Ambrose J. Ketter, P.E.

Water Structures Engineer Division of Water Resources

Kansas Department of Agriculture

(785) 296-2940

Table of Contents

A. Executive SU1l1Jl1ary .. .. . . . . . . .... . . . . .. . . . . . . . . . . . .. . . .. . ... . . .... . . . . . . . . . . . . . . . . . . . . . . . .. .. . 1

B. History. . . . . .. . . . . . . . . . .. . ... . . . .. . ... .. . .. . . . . . . . . . . . . .. . . . .. . . .. . . .. .. .. . . . . . . . . . . . . .. .. . . . . ... . . . . . . 1

C. Summary of Previous Inspection . .... .. . . . . . . .. .. . .... . . . . . ... . . . . . . ... .. . .. . .. . . .. . .. . 2

D. Current Inspection Findings . . . .. . .. .. . ... .. ... . .. . . . .. . . . . . . . .. ... . . . . . . .. . . . . . . .. . .. . . . . .2

E. Survey Infonn.ation . . . .. .. . . . . . ... . . .. . . . .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .. ..... . . . . ... 4

F. Discharge from Spillways and Drains . . . . . . . . . . .. . .. . . . . ..... . . . . . . .. . ..... . . .. .. .. . 4

O. Monitoring Devices . .. . . ... . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . .. .. . .... . . . . . . . . . . . . .. . . . . .... . . .4

H. Hazard Classification . . . . . . . .. . .. . . . .. . . .. . .. . .. . ... . . . . .. . . . . . .. . .. . . . . . .. . . . . .. . ..... .. . . . .. 5

1. Hydrology and Hydraulics Review .. . .......... . . . . .. . . . . . . . . . . . . . .... . . . ... . . . . . . . . . . 5

J. Emergency Action Plan (EAP) . . .. . ... . . . . . . .. ..... . . . . ... . .. . .... .. . ... . . . . . . . . ..... . .. 5

K. Maintenance and Operation Plan .... . . . . . . . .. . . . . . .. . . . . . . . . . . . . . . . . . ...... .. . . . . .. . ... 5

L. Items Needing Immediate Attention . . . .. .. . .. ... . . . . . . . . . . .. . . . . . . . . . .. . . . . .. . . . . . .. . 5

M. Maintenance Recommendations . .. . .. . . . . . . . ... . . . . . . . . . . . .. . .. .. . . . . . . . . . . . . . . . . . . . . ..6

N. Conclusion . . . .. . . . . . . ... . . . . . . . . .. . .. . .. . . .. . . . . . . .... . .. . . . . . . . . . . . . .. . .. . . . . . . . . . . . .. . . . . .. . . . . . . 7

Appendix

A. Copy of Dam Safety Field Inspection Checklist B. Quad Map - showing location of dam C. Field Sketch - showing location & direction of photographs taken during inspection,

and deficiencies as illustrated D. Photographs

DAM SAFETY INSPECTION REPORT CITY OF COUNCIL GROVE Council Grove City Lake Dam

WSN: DMR-0033 - NID: KS02512

A. Executive Summary

Council Grove City Lake Dam is owned by the City of Council Grove and is located on Canning Creek in the NW of the SEY.t of the NW of Section 8, Township 16 South, Range 8 East in Morris County, Kansas. It was inspected on March 2 and May 5, 2011 by Ambrose 1. Ketter, P.E., Water Structures Engineer with the Division of Water Resources (DWR). The inspection was conducted under the requirements of the Obstructions in Streams Act, K.S.A. 82a-303b.

There are no known records in the DWR files of any previous dam safety inspections for this structure.

Major findings from the current inspection include:

• Preliminary flood routing indicates that the dam is hydrologically adequate. • A significant amount of work will be required to remove trees and unwanted

vegetation from the back slope. • Because of a high hazard class rating, a breach analysis and emergency action

plan will be required. • A thorough investigation is needed to determine the condition of the intake tower

and the location and condition of all conduits through the embankment.

B. History

Council Grove City Reservoir is a size 4 structure. DWR records indicate construction was completed on January 1, 1940. Very little corroborative infonnation exists in DWR files concerning the original construction of this dam. A partial set of unapproved preliminary plans suggest that it was designed by S.A. Sulentic Construction Engineering, Topeka, Kansas and constructed by the Works Progress Administration (WPA) as a water supply for the City of Council Grove. It is currently owned and operated by the City of Council Grove.

The preliminary plans are in poor condition and offer infonnation that not only differs from sheet to sheet but at times also conflict with what is easily observable through a site visit. The top of dam elevation on these plans varies from approximately 1320 feet to 1354 feet. Similarly, an exact elevation for the level section of the spillway could not be found. Additionally, cross sections show a 3: 1 upper front slope with rip rap extending to a 15 feet wide benn at elevation 1300 and a 2: 1 grass covered back slope with no benn. However, during the inspection a well defined, rip rap-covered berm was found on the lower right back slope. It also appears that the entire back slope may have been covered with rip rap at one time. The DWR file for this dam contains several 8 inch X 10 inch black and white aerial photos dated 1943 that also show what appears to be rip rap on the entirety of the back slope.

--

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 NID: KS02512 Inspection date: March 2, 2011 and May 5, 2011

The plans show a multistage water supply inlet tower connected to approximately 300 linear feet of 16 inch diameter cast iron pipe that runs through the embankment. This pipe is connected to a brick-encased "Manhole" below the backside of the dam. The plan detail describes this as a vehicle for flushing the gate valve located in an adjacent pump house below the dam. The detail shows the 16 inch pipe diverting to a 10 inch cast iron pipe upstream from the pump house. The 10 inch pipe connects to the pump in the pump house and from there it is shown to extend to the City of Council Grove.

The inspection of the back slope area below the inlet revealed what appears to be the above "Pump House" and what is left of the "Manhole" (Photos 20-24). However, both structures have obviously had little or no maintenance for many years. What is believed to be the "Manhole" is now nothing more than a pile of limestone covering a cast iron pipe. The "Pump House' is still intact but is surrounded by encroaching trees and brush. A cast iron pipe outlets approximately 15 feet directly downstream from the structure. It is not known for certain if these structures are the same as those shown on the preliminary plans but they are located in the same general area.

Although the reservoir is the main water supply for the City of Council Grove, at this time no verifiable information could be found concerning the conduit through the dam embankment, intake tower condition, function and condition of the "Pump House" or the function of what appears to be the remains of the "Manhole". Additionally, the DWR has no information on the exact diversion point of the water supply line to the City of Council Grove.

Similarly, the varied condition of several areas of concrete in the service spillway suggests that it has undergone undocumented modifications or repairs since the dam was constructed.

The dam is approximately 57 feet high from the crest to approximate streambed at centerline and approximately 2,400 feet long (excluding the service spillway).

c. Summary of Previous Inspection

The only known inspection since construction of this dam is a courtesy inspection completed by the Anny Corps of Engineers in 2006. The DWR is not in receipt of a copy of this inspection.

D. Current Inspection Findings

The dam was inspected on March 2 and May 5,2011, by Ambrose J. Ketter, P.E., Water Structures Engineer for the Division of Water Resources. Two partial surveys were also conducted on May 5th and June 3rd•

The weather on March 2nd was sunny with a temperature of about 60 OF. There had been little precipitation during the preceding week, the surrounding ground was dry. The

Page 2 of8

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection date: March 2, 20 I I and May 5, 2011

reservoir level was approximately 4 inches below normal pool. The weather on May 5th was cloudy with a temperature of about 70 degrees. The surrounding area had received some precipitation in the preceding days and a light rain a few hours before the inspection. However, the embankment was still mostly dry. The water level of the reservoir was approximately at nonnal pool. The inspection was done by walking the upstream slope, downstream slope, top of dam, and throughout the service spillway channel.

Major findings are as follows:

• -Top of Dam The dam top is traversed by a gravel road (Photos 1-3). This road

appears to be well maintained with good quality gravel. No wash-boarding, wheel ruts, erosion channels, or potholes were visible during the inspection. No slumping or instability was found on the top of the dam. Seven power poles are located across the front side of the dam top.

• Upstream Slope - The lower left half of the slope is infested with sumac and grape vine (photos 5-8). The rip rap on the lower slope is somewhat degraded and does not appear to extend high enough to offer adequate protection during high water. Additionally, the rip rap varies from gravel size to large limestone blocks (photos 5-11). Moderate wave scarping can be seen throughout (Photo 10). The water line is uneven and the embankment is non-unifonn. The upper slope is covered with thin grass but it is generally free of weeds (Pbotos 6, 8, 9, and 13). Overall, the slope is steeper than the 3: 1 shown on the original plans.

• Downstream Slope - A large portion of the slope is covered with dogwood, sumac, small trees, and brush (Photo 25). The right side of the slope is in very poor condition with respect to vegetation. Large, mature trees and thick brush have taken over the right groin area and downstream toe. (Photos 14-19). Much of the back slope contains what appears to be deteriorated rip rap (Photo 17).

• Service Spillway - The service spillway is an approximately 150 feet wide concrete lined channel with a 5 feet wide concrete level section (Photo 27) and a concrete and limestone drop structure (Photos 31 and 32) approximately 120 feet downstream. The concrete in the channel is in good condition considering its age. Mature trees surround both sides of the channel. Some minor cracking of the concrete due to uplift or tree roots is visible in a few areas (Photo 28). A few small trees and some moderate weed infestation can be seen in the construction joints throughout the channel (photos 29 & 30). It appears that the level section and the downstream drop structure have been replaced or modified in the past few years. Concrete in these areas appears to be newer than that of the rest of the spillway. Additionally, concrete patching is visible over and around the downstream drop section (photos 31 & 32). The downstream area of the channel is covered with large rip rap interspersed with small willows and cottonwood trees. During the March 2n site visit, seepage was noted in the downstream area near the right abutment below the drop structure. The area was covered with

Page 3 of8

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection date: March 2, 2011 and May 5, 2011

Scour Rush and measured approximately 30 f et in width by 60 feet in length. The seepage rate measured approximately 10 gallons per minute and the flow was clear.

• -Outlet Works At the downstream base of the right side of the dam is what

appears to be the original outlet works. A concrete valve box ("Pump House") attached to an open pipe is situated to the right of what looks like a valve handle (photo 20). To the left of this concrete box is what appears to be the limestone foundation of another structure (Possibly the "Manhole" shown on the preliminary plans) on top of an open cast iron outlet pipe (Photo 24). Several other valves or metering devices are also located nearby. ALthough the reservoir is a water supply for the City of Council Grove, these devices do not seem to have been in use for many years.

E. Survey Information

Two partial surveys using GPS were conducted on May 5th and June 3rd• Surveys were run along and across the dam embankment and service spillway to obtain precise relative elevations using an assumed datum. However, these elevations were not tied to a USGS monument. Actual elevations were approximated to within 1 foot of accuracy based on digital terrain modeling using 1 foot Light Detection And Ranging (LIDAR) contours.

The main purpose of the surveys was to establish accurate relative differences between the low point in the top of dam and the service spillway control section. The surveys on May 5th and June 3rd indicated a difference in elevation of between 8.61 feet and 8.53 feet respectively. Using LIDAR contours at the service spillway control section, an approximate elevation of 1345 feet was assumed. The more conservative estimate of 8.53 feet was added to arrive at a top of dam elevation of 1353.53.

Reservoir areas at various elevations were measured from U.S.O.S topographic maps and then used to provide data for the flood routing analysis.

F. Discharge from Spillways and Drains

The reservoir level on March 2nd was approximately 4 inches below the spillway level section. On May 5th the water level was estimated to be at normal pool. About 1 inch of water was running over the low spot in the level section. There are no known drains for this structure.

G. Monitoring Devices

There are no known monitoring devices for this dam.

Page 4 of8

I.

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection date: March 2. 2011 and May 5, 2011

H. Hazard Classification

The dam had been classified as a class 'a' low hazard structure since initial construction. A hazard classification evaluation was completed in conjunction with this safety inspection.

Because of the possible inundation of Canning Creek Cove Recreational Area and because Council Grove City Lake is the primary water supply for the City of Council Grove, state regulations require that this structure be classified as a class "c" high

hazard dam.

Hydrology and Hydraulics Review

Current Division of Water Resources requirements for a size 4 high hazard structure dictate that the dam should pass a flood event generated by the equivalent of 400/0 of the 6-hour probable maximwn precipitation (PMP) with three (3) feet of freeboard. Our floodrouting of this design storm indicates a freeboard of approximately 3.4 feet. Therefore, the dam is considered to be hydrologically adequate.

J. Emergency Action Plan (EAP)

A high hazard class EAP conforming to the requirements of K.A.R. 5-40-73 and a periodic three year inspection conducted by a qualified, licensed professional engineer will be required. Information on these requirements can be found on the D WR website at http://www.ksda.gov/includes/statute _regula tions/mainportallObstructions _in_Streams _Dam _ r egulations.pdf

K. Maintenance and Operation Plan

There is no maintenance and operation plan for this dam on file with the DWR. The City of Council Grove is responsible for maintenance and operation.

L. Items Needing Immediate Attention

• Enlist the services of a qualified, licensed professional engineer to perfonn a breach analysis to be used in the construction of an emergency action plan as per K.A.R.S-40-73.

• Enlist the services of a qualified, licensed professional engineer to analyze the original outlet works (including all conduits through the dam embankment) and, if necessary, submit a plan/schedule for repairs, removal, modifications, etc.

Page 5 of8

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection date: March 2, 2011 and May 5, 2011

M. Maintenance Recommendations

• Remove all trees, brush, dogwood, sumac, and any vegetation other than erosion­resistant grass from the front slope, back slope, groin/abutment areas, and for at least 30 feet from all areas of the dam toe. (The DWR suggests spraying the brush, dogwood, and sumac with herbicide to completely kill the root system before cutting and removal.) Brush and trees less than 12 inches in diameter should be cut flush with the ground and removed. Treat tree stumps with a waterproof sealant and allow them to decay slowly. Monitor these stumps until they are gone and, if necessary, fill and compact any voids with quality embankment. Trees larger than 12 inches in diameter should be completely removed and the root ball voids filled and compacted with quality embankment. (The two or three large oak trees at the base of the dam should remain. Aerial photos of the dam from 1943 suggest that these trees were left in place during construction. Although in an undesirable location, removal of such large trees in this area may jeopardize the dam's structural integrity. Should any of these trees die in the future, complete removal is advised.) Seed all disturbed areas with erosion-resistant grass.

• Develop a maintenance plan/schedule for the dam. It should include at least a twice-yearly mowing and/or a yearly burning program to keep the grass height low and the embankment free of undesirable vegetation.

• Consideration should be given to the addition/repair of the erosion protective riprap on the front slope. The DWR should be contacted before any construction activities are initiated. Depending upon the extent of the repairs, a permit may be required.

• Remove all trees and brush from the joints in the service spillway. Repair/replace damaged concrete and remove any trees on the sides of the spillway capable of causing uplift damage.

• Monitor seepage in the lower section of the spillway during and after high water events. Report turbid discharge to the DWR or to a qualified, licensed professional engineer.

• If a monetarily feasible opportunity arises, relocation of the power poles from the dam top is advised. The DWR shou1d be consulted before removal.

Page 60f8

--

http://www.fema.gov/library/viewRecord.do?id=1451

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 NID: KS02512 Inspection date: March 2, 2011 and May 5, 2011

N. Conclusion

Considering its age and lack of oversight, the dam appears to be in very good condition. However, it is possible that an investigation of the outlet works could prove otherwise. The conduit through the embankment is one of the most crucial safety-related components of a dam. A damaged or leaking conduit can be a serious safety concern. Additionally, repair or replacement can be extremely expensive and labor intensive. Although no indication of any safety issues related to the conduit were found during the inspection, a thorough investigation of the tower and conduit is warranted.

Trees and brush on the back slope are a serious concern. Tree root penetration loosens the soil of an embankment slope and creates a condition more conducive to surface water penetration and slope failure. Dense growths of trees and woody or tall vegetation not only provide a hindrance to proper dam safety inspections, but can also be detrimental to the structural integrity of the dam. Tree roots can also act as conduits for water infiltration through the dam. The presence of trees obstructs the growth of erosion­resistant grass and encourages the presence of rodents. Due to the close proximity to the zone of saturation, the blow-over or death/removal of a mature tree on a dam slope leaves the embankment vulnerable. Prompt removal of the brush and smaller trees will not only be more cost effective, but will be much less labor-intensive than if they were allowed to mature.

The Dam Safety Team is aware of the difficulties involved in the maintenance of the back slope. The steepness of the slope and the presence of what appears to be disintegrated rip rap throughout make mowing problematic. (Trus is probably the reason for the current situation.) Few known alternatives are available. One option could be the addition of rip rap thick enough to provide erosion protection and prohibit vegetative growth. Unless a source of materials is available to the city, this could be very expensive and time consuming. Another possible solution might be the addition of a layer of top soil to support the growth of erosion-resistant grass. This could also be very expensive and would probably be viable only if the city is capable of mowing the slope. A trurd option may be to bum the slope every spring combined with an overall re-seeding program. This should stop the growth of young trees and slow the growth of undesirable weeds. The ultimate goal would be to have the dam covered in a thick stand of erosion-resistant grass (or impenetrable rip rap needing no mowing or vegetative control), wruch is easily accessible to mowing and maintenance equipment. It should be maintained to a height low enough to allow a thorough inspection of any seepage areas or safety concerns. A combination of some or all of the above suggestions may be a possible alternative. The D WR should be contacted prior to the start of any construction activities.

For information on the effects of trees and undesirable vegetation, please refer to the Federal Emergency Management Agency 'Technical Manual for Dam Owners Impacts-

of Plants on Earthen Dams' (Also known as FEMA 534). A copy of this can be found online at:

Page 70f8

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS025I2 Inspection date: March 2, 20 II and May 5, 2011

As mentioned above, the rip rap on the front slope is showing signs of age related wear. Although it does not appear to be a significant safety concern at this time, it will eventually require attention. If the water level of the reservoir is ever lowered for maintenance, repairs, or possibly to investigate the intake tower, it would be a good time to inspect the conditions of the lower front slope and make repairs (After approval by DWR) if necessary.

Finally, some of the recommendations could be affected by the findings of the outlet works investigation. For example, tree removal or the addition of riprap, could possibly be coordinated with construction activities if it is found necessary to repair or replace items associated with the conduit or intake tower. It is possible that some of the above items would be non-issues if embankment work were required in the area of concern. Therefore, the outlet works investigation should be completed as soon as feasible. The

emergency action plan should be submitted and the above recommendations

initiated no later than within six months of the date of tbis report.

Page 8 of8

Appendix Copy Safety Inspection A - of Dam Field Checklist

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KANSAS DEPARTMENT OF AGRICULTURE DIVISION OF WATER RESOURCES

DAM SAFETY FIELD INSPECTION CHECKLIST

Water Structure No. D -D

Date of Inspection: 5 - S -Inspection Team: Inspection Type: __Screening __Monitoring (Annual) __Significant Event __Full Initial Priority for Full Initial Inspection? I , II , III

Owner: 0 cO(.A 1\ ( b(" t:> e.. Site Name: Co, f(Contact Person(s)/Telephone No(s):

7 8 - -c...

Weather: Reservoir Level: Apparent Beneficial Use of Water? Current Hazard Classification:

Deficiency Codes: O=Adequate/None. 1 =Monitor Deficiency. 2=Deficiency Requires Future Repair. 3=Maintenance Action Needs Immediate Action. 4=Deficiency Requires Immediate Action.

General Conditions {2- Alterations to the dam?

Q - Recent high water marks? El.

- Adequate grass cover? Q. - Fencing adequate?

Comment

1- Erosion? B ,. h.1 S"'-""doC, t- vi..., 0 V\ IJ. "0. t F I!'J F..s /ofJ e.. ..3 - Trees? 52- Rodent holes? .! lolc> Very .s pf Q - Cracks, settlement, bulges? ..reo. r 0...... I Oc..J t' ..! 10ft! .;J.. - Adequate slope protection (riprap)? )fA e.r {e Scc r p o"

Abutment Contacts 0- Erosion, cracks or slides?

Inlet ,AI' -1.. - Trashrack adequate?

? - Obstructions to inlet? ? - Damage to concrete/pipe inlet?

! - Drawdown operative?

Y-v -No""'" Ft- eVl(:tf0'-"-" r £I0 f r-+ .s ( c( .

Downstream Q - Erosion? .3 - Trees?

R:t, A-h c-fMtoV' f r pe;.. r tvT c) .s f F R f S \ c!, (O;e l. .. "1

a. - Rodent holes?

a- Cracks, settlement, bulges? l2 - Seepage/damp spots?

Abutment Contacts Q - Erosion, cracks or slides? fL. - Seepage?

DWR 2-300 Rev. 8/6/96

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Principal Spillway Outlet/Stilling Basin

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Deficiency Codes: O=Adequate/None. l=Monitor Deficiency. 2=Deficiency Requires Future Repair. 3=Maintenance Action Needs Immediate Action. 4=Deficiency Requires Immediate Action.

- Damage to concrete/outlet pipe? - Leakage? - Joint material lost? - Under-cutting pipe? - Riprap/scour protection adequate? - Outlet channel obstruction?

Comment

Dam Crest 0- Any settlement, misalignment? a- Erosion? 12 - Cracks, bulges? 12 - Undesirable vegetation?

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a - Roadway or trails?

Reservoir

(2 - Development or fill?

Q - Unstable banks or slopes?

Downstream

t2 - Downstream development changes? Q- Sand boils?

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DISCLAIMER: The Chief Engineer, by providing this dam safety field inspection checklist does not assume responsibility for any unsafe condition of the subject dam. The responsibility for the safety of this dam rests with the dam owner or operator, subject to the regulatory authority of the Chief Engineer as provided by the Obstruction in Streams Act, K.S.A. 82a-30 1 et seq. The dam owner or operator should take every step necessary to prevent damages caused by leakage or overflow of waters from the reservoir or floods resulting from a failure of the dam.

Inspected by: Date: I

Reviewed by: Date:

ndix Quad Maps B and Aerial -

Appendix C - Field Sketch (Showing location/direction of photos

and deficiencies as illustrated)

ndix Photographs D -

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 1

Top of dam looking southeast from left abutment

Photo 2

Top of dam looking southeast

Page 1 of 17

Photos by Ambrose Ketter

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 3

Top of dam looking northwest

Front slope looking southeast from left abutment

Page 2 of 17

Photos by Ambrose Ketter

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City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 20 II

Lower front slope looking southeast

Photo 6

Front slope looking southeast

Photos by Ambrose Ketter

Page 3 of 17

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 7

Photo 8

Photos by Ambrose Ketter

Lower front slope looking northwest from approximately center of dam

Page 4 of 17

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Front slope looking southeast from approximately center of dam

Photo 10

Wave damage on lower front slope toward right side of dam

Page 5 of 17

Photos by Ambrose Ketter

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 11

Front slope looking northwest from right abutment

Photo 12

Right abutment of front slope looking southeast

Page 6 of 17

Photos by Ambrose Ketter

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City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 13

Photos by Ambrose Ketter

Right side of front slope showing position of intake tower relative to dam

Photo 14

Large cottonwood tree on upper right downstream abutment

Page 7 of17

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 15

Photos by Ambrose Ketter

Back slope looking northwest (Note large oak trees at toe of dam)

Photo 16

Trees and brush in right downstream groin/abutment area

Page 8 of17

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City of Council Grove Council Grove City Lake Dam

WSN: DMR-0033 NID: KS02512 Inspection Dates: March 2 & May 5, 2011 Photos by Ambrose Ketter

Upper back slope covering of sparse grass and deteriorated rock

Photo 18

Benn on right side of back slope looking northwest

Page 9 of17

City of Council Grove Council Grove City Lake Darn WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 19

Photos by Ambrose Ketter

Lower portion of back slope benn on right side of dam (note brush, trees and rip rap)

Photo 20

Concrete "Pump House" at base of right side of dam looking downstream

Page 10 of 17

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5. 2011 Photos by Ambrose Ketter

Photo 21

Concrete "Pump House" looking upstream toward dam

Photo 22

Outlet pipe from concrete "Pump House"

Page 11 of 17

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 23

Photos by Ambrose Ketter

"Pump House" and "Manhole" looking upstream toward dam showing relative positions

Photo 24

Remains of "Manhole" with outlet pipe

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City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Photo 25

Photos by Ambrose Ketter

Back slope looking southeast from base of dam

Photo 26

Back slope looking southeast from left side of dam

Page 13 of17

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011

Upper end of service spillway

Photo 28

Cracking in service spillway

Photos by Ambrose Ketter

Page 14 of 17

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011 Photos by Ambrose Ketter

Photo 29

Upper end of service spillway

Photo 30

Service spillway channel

Page 15 of 17

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5, 2011 Photos by Ambrose Ketter

Service spillway channel drop structure

Photo 32

Seepage in service spillway drop structure

Page 16 of17SCANNED

City of Council Grove Council Grove City Lake Dam WSN: DMR-0033 -- NID: KS02512 Inspection Dates: March 2 & May 5,2011

Photo 33

Downstream area of service spillway below drop structure

Photo 34

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Photos by Ambrose Ketter