15904 PPT PIM 1-30-19 v4.pptx [Read-Only]
Transcript of 15904 PPT PIM 1-30-19 v4.pptx [Read-Only]
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Public Information MeetingJanuary 30, 2019
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Agenda
• Welcome and Introductions • Project Update• Update on Environmental and Cultural Resource Coordination• Project Alternatives• Bridge Rehabilitation Study• Traffic Study• Alignment Study• Next Steps
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Project Update
• Completed assessment of existing conditions of bridge (summer/fall 2018)
• Prepared Traffic Study (fall 2018)• Prepared Rehabilitation Study
(fall 2018)• Prepared Alignment Study
(fall/winter 2018)
Looking south
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Project Update
• Met with vessel users (October 2018)
• Met with Project Advisory Committee (November and December 2018)
• Met with abutters (December 2018)
First Public Information Meeting
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Environmental Resources
• Completed field investigation for wetlands and Wetland Report (summer/fall 2018)
• Completed field inspection surveys for NLEB (summer/fall 2018)
Bridge structure Pumphouse structure
• Completed field survey for habitat types (summer/fall 2018)
• Completed field survey for listed plant species (summer/fall 2018)
• Natural Resources Agency Coordination Meeting (January 2019)
Seabrook approach
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Cultural Resources
• Completed Phase 1A Archaeological Assessment (fall 2018)
• Completed Project Area Form (fall 2018)• Completed Individual Inventory Form for
bridge (fall/winter 2018)• Identified additional properties for further
investigation and initiated documentation (fall/winter 2018)
• Undertook site walk with NH Division of Historical Resources and consulting parties (January 2019)
Bridge looking north
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Purpose and Need
Purpose• Provide a safe, reliable, and structurally
sound crossing• Improve mobility for the travelling
public (vehicles, bicyclist, and pedestrians) and marine users
Need• Structurally deficient and functionally
obsolete bridge• Many original mechanical components
and outdated electrical system• Substandard shoulder and sidewalk
widths
Deteriorated pinion and coupling, key elements of lift mechanism –Interim Repairs in 2018
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Project Alternatives
• Three alternatives under consideration Rehabilitation Replacement with Fixed Bridge Replacement with Bascule Bridge
• Various alignment options and heights
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Bridge Rehabilitation Study
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Study of Rehabilitation Alternative
• Assessed rehabilitation for current capabilities, long term viability and for serving the purpose/need of project
• Requires significant modifications to carry current design loads, even without widening
• Insufficient capacity for widened roadway
• Geometry of bascule pier restricts ability to update mechanical systems Typical Bridge Underside
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Study of Rehabilitation Alternative
• Two Rehabilitation Alternatives under consideration
Replacement of full superstructure to widen bridge
Second movable bridge • Bridge would need to be modified
to carry modern design loads• Providing widened roadway to meet
needs of travelling public requires replacement of the entire superstructure (all steel girders) and widening of piers
Bridge open to allow for vessel passage
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Questions• Before moving to the next section, please ask any questions you may have regarding
Natural and Cultural Resources Rehabilitation Study
Bridge Looking West
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Traffic Study
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Traffic Study
• Roadway Element Assessment: Travel Lane Shoulders Sidewalk
• Methodology Evaluation of Existing Conditions Projected Growth and Future Volumes Coordination with local and regional
planning commissions Proposed Conditions - Rehabilitation,
New Bascule, & New Fixed Bridge Propose widths of roadway elements
based on studyLooking downward at bascule span
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Traffic Study – Roadway Capacity
• Lane Number Determination Considered 2, 3, & 4 Lane Options
• Analyzed capacity of lanes in bridge area Capacity substantially higher than traffic
volumes across bridge• Bascule operations impact on traffic flow
investigated Current lanes sufficient to clear queues
between lifts• 3 and 4-Lane Cross Section Provides
Minimal Benefit based on roadway capacity at bridge
Creates more challenging pedestrian crossings
High volume of U-turns at Ashworth• 2-Lane Option Selected
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Shoulder and Sidewalk
• Shoulder Width Considerations Requirements and Guidelines for Bicyclists - 6’-8’ Debris and Bridge Scuppers Limit Useable Shoulder Width Wider shoulders provide improved ability for Emergency Vehicles to Pass
• Sidewalk Width Considerations Hampton Beach Master Plan (HBMP) Goals to Improve Pedestrian and Bicycle
Safety & Provide Greater Connectivity to Resources North and South of Bridge Pedestrian Desire Lines on East and West Sides of Bridge Opportunities for Mix of Travel Speeds and Activities (Fishing, Biking, Walking)
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Roadway Cross Section
8’ 8’
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Alignment and Profile StudyIntroduction
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Key Variables
• Roadway slope Steeper slopes reduce approach impacts and improve
navigation Flatter slopes improve vehicular, bicyclist and
pedestrian access• Vessel Navigation Clearances
Higher clearances improve navigation and reduce impacts to roadway traffic
Lower clearances reduce approach impacts Sea Level Rise
• East vs West vs Existing Alignment Impacts of both alignments must be considered
• Impacts on Roadway Approaches Informs impacts to resources, right-of-way and
facilities on approaches• Constructability and Cost
Full cost estimates not developed at this stage, but qualitatively considered
Roadway Slope Serviceability for Ped and Bike
3%-4%Desirable for Pedestrians and Bicyclists
5%-6%Acceptable Per Code Requirements
7% or More Less Desirable
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Navigational Clearances
18’±
Existing Navigational Clearances per Coast Surveys at Mean High Water
51’± (Actual)40’ (Posted)
• Bascule Bridge Height increases do not need to pass all
vessels Horizontal Clearance allows clearance of
USACE dredge equipment Decreases required lifts
• Fixed Bridge Height may restrict future navigation Must serve needs of navigational users Future use must be considered Horizontal Clearance matches
navigational channel width
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Navigational Clearances
Vertical Underclearance
(from MHW)
Approx. Percentage of Lifts Eliminated
59’ Greater than 97%44’ Greater than 90%34’ Greater than 55%18' Current Clearance
MHW: Mean High Water
Note: Percentages listed are minimum passed based on available information. Percent of lifts eliminated may be higher as additional vessel user information becomes available.
• Bascule Bridge Proposed channel clearance: 80’ Width,
34’ Height with bridge in down position• Fixed Bridge
Proposed channel clearance: 150’ Width, 44’ Height
59’ Height considered, not carried forward pending review by agencies
• Clearances include 3.9’ Sea Level Rise “Intermediate-High” range of estimated
2100 rise by NH Coastal Risk and Hazards Commission 2016 Report
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Navigational Vertical Clearance
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Alignment and Profile StudyReview of Alignment Options
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Horizontal Alignment - Online Full Closure w/ Regional Detour
Construction Schedule 2+ years depending on Environmental Restrictions
Required detour is approx. 12 miles Temporary Bridge Required
Increases Cost Significantly – on the order of $20 million or more based similar project
Lengthens Construction Duration by 1 year or more for construction of temporary moveable bridge
Detour Map
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Horizontal Alignments – East and West
West Alignment Assets East Alignment AssetsBusinesses Residences State Pier State ParkConservation Area Sensitive HabitatBeach BeachHampton and Seabrook Channels Entrance ChannelUtilities
Identified Assets in Area
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Eastern Alignment
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Eastern AlignmentSouth Approach
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Eastern AlignmentNorth Approach
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Western Alignment
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Western Alignment
South Approach
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Western AlignmentNorth Approach
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Horizontal Alignments - Offline
Western Alignment
Eastern Alignment
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Summary of Alignment Impacts
West Alignment East AlignmentUnderwater and Underground Utilities Underground Utilities
Hampton and Seabrook Channel Entrance ChannelBeach usage at South Abutment Beach usage at South Abutment
Sensitive Habitat / Conservation Area Sensitive HabitatPotential Impact to Businesses
And Driveway Impacts to State Park Entrance
Impacts to homes on SE quadrant
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Questions• Before moving to the next section, please ask any questions you may have regarding
Alignment and Profile Study
Bridge Looking West
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Conceptual Bridge Renderings
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Summary – Bascule Bridge, 34’ Clearance
• Provides improved underclearance for vessels Clears USACE dredging equipment Reduces lifts by over 50% based on current usage Does not provide full 150’ horizontal clearance
• Bridge will be required to lift and will still affect traffic• Provides desirable roadway grade – 4% slope• Smallest Impact on Approaches
Low height increase at abutment: 5’ +/-• Costs
Bascule Bridge - significantly higher capital costs compared to a fixed bridge Higher risk of costs associated with serviceability – system breakdowns can impact vehicular and
vessel traffic Increased life cycle costs associated with operating the bridge and maintaining
mechanical/electrical systems
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Bascule Bridge – West Alignment
Aerial of Existing Bridge
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Bascule Bridge – West Alignment
Aerial of Proposed Bascule Bridge
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Bascule Bridge – West Alignment
Looking Southwest at North Approach
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Bascule Bridge – West Alignment
Looking Southwest at North Approach
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Bascule Bridge – West Alignment
Looking West at South Approach - Existing
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Bascule Bridge – West Alignment
Looking West at South Approach – Proposed Bascule
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Summary – Fixed Bridge, 44’ Clearance
• Provides improved underclearance for vessels Clears at least 90% of current lifts Clears all regular users Provides significant improvement for horizontal clearance – 150’ Clears USACE dredge equipment at low tide
• No bridge lifts required with fixed structure• Provides acceptable roadway grade – 5% slope• Balances impacts on approaches
Height increase at abutment: 10’±• Fixed Bridge - significantly reduced capital and life cycle costs compared to a
bascule bridge• Bridge can be designed to carry utilities across the harbor
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Fixed Bridge – West Alignment
Aerial of Existing Bridge
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Fixed Bridge – West Alignment
Aerial of Proposed Fixed Bridge
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Fixed Bridge – West Alignment
Looking Southwest at North Approach - Existing
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Fixed Bridge – West Alignment
Looking Southwest at North Approach – Proposed Fixed Bridge
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Fixed Bridge – West Alignment
Looking West at South Approach - Existing
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Fixed Bridge – West Alignment
Looking West at South Approach
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Next Steps• Meet with NH Division of Historical Resources in February• Continue to develop alternatives; Complete Type, Size and Location
Study • Ongoing meetings with Public Advisory Committee• Continue coordination with US Coast Guard, US Army Corps of
Engineers, other reviewing agencies• Review study findings at Public Information meeting (spring/summer
2019)
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Questions• Please ask any questions you may have regarding this presentation.
Bridge Looking West
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Thank You