nhdot andover 40392 po-pi meeting presentation2.pptx …...microsoft powerpoint - nhdot_andover...
TRANSCRIPT
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ANDOVER 40392US Route 4 over Blackwater River (Br. No. 143/077)
Public Officials Meeting
May 20, 2019
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Project Location Map
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Project Location Aerial Photo
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Floodplain Map
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Existing Bridge Information
US Route 4 over Blackwater River - Br. No. 143/077• Built in 1933
• Steel Through Plate Girders, Steel Floor Beams and a Reinforced Concrete Deck
• Reinforced Concrete Abutments on Spread Footings and Timber Piles
• Span Length: 70’-0”
• Bridge Skew: 0o
• Travel Width: 24’-0”• Red List, 2014
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Site Photos
Looking Easterly over Bridge Looking East along East Approach
Looking Westerly over Bridge Looking Westerly at Bridge Looking Westerly from Bridge
Looking West along West Approach
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Existing Bridge Photos
Looking Downstream from Bridge
Holes in Plate Girder
Expansion Rocker Bearing Expansion Abutment
Section Loss in Bottom FlangeLooking Upstream from Bridge
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Existing Bridge Photos
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Emergency Repairs Fall 2014
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Bridge Replacement
• Proposed bridge at same location
• Span length = 100’-0” to accommodate Stream Crossing Rules
• Proposed steel girders with composite concrete deck
• Bridge travel width increased to 32’-0”– 11-foot lanes and 5-foot shoulders
• 5-foot shoulders to accommodate bike traffic
• 3-bar steel rail
• Integral Abutments on Steel Piles– Construct behind existing abutments
– Part of existing abutments to remain in place• Use as cofferdam during construction
• Scour protection
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Proposed General Plan
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Bridge Deck Sections
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Maintenance of TrafficThree Alternatives– Bridge replacement using Accelerated Bridge
Construction (28-day closure) and detour on state routes (16 miles for US 4 thru traffic; 22 miles from one side of bridge to other)
– Bridge replacement using conventional construction (3-4 month closure) and detour on state routes (16 miles for US 4 thru traffic; 22 miles from one side of bridge to other)
– Bridge replacement using conventional construction and a temporary on-site diversion upstream (north side) with temporary bridge to maintain alternating two-way traffic with signals (construction duration 4-5 months)
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Detour Plan
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Cultural and Natural ResourcesCultural Resources
• No Cultural Resources have been identified currently– The bridge was determined to be Not Eligible for National
Register of Historic Places
– If temporary on-site diversion for traffic control is proposed, an Archeological Phase 1A survey will need to be done
Natural Resources
• Prime Wetlands south of bridge
• Endangered Species– Northern Long Eared Bat survey will be done
– Brook floater mussels (survey may be required if impacts to channel are anticipated)
• Entire project in Zone A Floodplain
• Conservation Land: Conservation easement located south of US Route 4 and west of Blackwater River (Avoid impacts)
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Right-of Way
• Assumed to be 66 feet wide
• Some property right acquisitions and/or easements are anticipated
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Schedule
• Advertise Winter 2021
• Construction Begin Spring 2022
• Construction Completion Fall 2022
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Input Needed
• Bus Route
• Pedestrian Usage on US Route 4
• Bike Usage on US Route 4
• Local Events that impact traffic or bring more traffic to US Route 4
• Emergency Response
• Preferred closure time, if ABC used (Spring, Summer, or Fall)
• Flooding History
• Other Concerns or Comments
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Questions???