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Project Title & Location
US 101 - Purdy Creek Bridge - Mason County
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Project Description
This project replaces the US 101 Purdy Creek Bridge in the Skokomish River Valley in Mason County. The Purdy Creek Bridge site is the lowest point of US 101. The hydraulics of the Lower Skokomish River frequently results in floods, closing US 101. This new bridge will accommodate the 100-year flood as well as possible changes to the course of the Skokomish River by constructing a raised roadway near Purdy Creek with a sufficient opening for flood water to pass through.
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Contractor/Consultant
Berger/Abam
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Recent Progress
Hydraulic and Scour Analysis and scientific modeling of flood effects have been completed and approved. The structure length for the new bridge has been finalized at 350-feet to optimize safety, conveyance and flood effects. A preliminary bridge plan has been approved. Initiating geotechnical efforts for the final design.
Draft environmental documents have been updated and are under review to finalize for submittal to federal services and state agencies. The project office is working closely with Mason County, the Skokomish Tribe, WDFW, Ecology and the Corps of Engineers to collaborate a permittable design. The PFA has been approved for content and is being updated to form. Draft R/W Plan complete and under review. Appraisals have begun to determine R/W acquisition costs. Utility as-builts have been received. Coordinating with region Traffic and Construction Offices to complete work zone traffic control strategy.
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Design Construction Impacts
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Environmental Impacts / Compliance
This project design is governed by local flood ordinances and State & Federal policy acts. The project design office is working with local state and federal governments in order to develop the best solution for the new bridge.
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Impacts to Traffic
The replacement bridge will be built on a new alignment. This will allow traffic to use the existing bridge during construction, eliminating the need for detours and other heavy traffic impacts.
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