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Project Title & Location
I-5 Salmon Creek Widening - Vancouver
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Project Description
This project will widen Interstate 5 from milepost 3.64 to milepost 7.49, from two lanes in both directions to three lanes plus an auxiliary lane between NE 99th Street and NE 134th Street. It will construct two parallel bridges on I-5 over Salmon Creek and a new structure for NE 129th Street over I-5 to accommodate the widening.
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Contractor/Consultant
Hamilton Construction Company, Springfield, OR
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Recent Progress
Design was completed and the contract was advertised five months ahead of schedule. The bid was 3.45% lower than the WSDOT’s engineers’ estimate.
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Design Construction Impacts
Groundbreaking scheduled for August 19, 2003. Stage 1 consists of planning and pre-leveling the median to prepare for a traffic shift to the detour bridge and closure of the NE 129th Street bridge to demolish and construct a new structure. Stage 2 includes constructing a temporary structure to accommodate two southbound lanes of traffic. Stage 3 includes demolishing of the existing northbound structure and construction of the new northbound structure over Salmon Creek. When the structure is complete, both northbound and southbound traffic will be shifted onto it. Stage 4 will consist of demolishing the detour bridge and the old southbound bridge, and construction of the new southbound structure. Stage 5 will consist of final paving and striping of the new roadway.
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Environmental Impacts / Compliance
A cantilever retaining wall will be constructed to avoid impacting Tenny Creek. Three noise barriers will be built to address increased noise levels. All storm water runoff from the project will be collected and detained in a stormwater pond prior to release to Tenny Creek.
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Impacts to Traffic
Northeast 129th Street will be closed beginning January 2004 for approximately five months. I-5 will maintain two lanes of traffic for both northbound and southbound directions throughout construction.
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