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Project Title & Location
I-5/Second Street Bridge - Replace Bridge - Mount Vernon
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Project Description
This project replaces a low-clearance bridge over I-5, eliminating a through-city detour now required for over-height trucks. The new bridge eliminates the risk of over-height trucks hitting the bridge over busy I-5 and will meet seismic standards.
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Contractor/Consultant
Project was awarded to Mowat Construction on June 1 for 2% over engineers estimate.
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Recent Progress
The project is roughly 50% complete. The contractor has drilled and poured all 21 shafts that make up the foundation of the new bridge. They have also poured all the concrete columns that support the new bridge. Currently they are building and forming the supports for the future concrete roadway across spans 1 and 2 of the bridge. They are also placing framework for the bottom slab of spans 3 and 4 of the bridge. The west section of the bridge, near downtown Mount Vernon, is halfway complete.
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Design Construction Impacts
The project start date was delayed to investigate the Contractor's proposed design changes to the new bridge piers next to I-5. This change reduced the number of days the bridge is closed from 225 to 210, saved $104,000, and reduced traffic control on I-5. Contractor started work three months later than originally scheduled to give the Contractor time to redesign the bridge and give WSDOT time to review the changes. The change was accepted and the Contractor began removing the existing bridge in late October.
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Environmental Impacts / Compliance
No significant impacts. Agreement with the City of Mount Vernon to treat water from new bridge.
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Impacts to Traffic
Traffic will be detoured through Mount Vernon at night when full directional closure of I-5 is required (Contractor has used 3 of the 23, I-5 closures allowed in the contract). Mitigation efforts include a comprehensive public awareness campaign. The next I-5 closures may occur late May early June to place forms over I-5. The forms will be used to build the new bridge.
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