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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
Project not yet advertised or awarded.
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Recent Progress
Recent progress has included completing the project hydrologic analysis. This involved updating and improving the HEC-RAS model completed in 1999 for the project. The consultant developed the model with the assistance of a Technical Advisory Group consisting of Mason County and Skokomish Tribe hydraulic experts. Now that the study is complete, the project office is now able to analyze different bridge lengths and effects on future hydraulic conditions, flood regulation compliance, impacts to downstream property, ecosystem benifits and long term maintenance.
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Design Construction Impacts
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Environmental Impacts / Compliance
This project design is governed by local flood ordinances. The project design office is working with local governments in order to develop the best solution for the new bridge.
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Impacts to Traffic
The new bridge will be built on a new alignment. This will allow traffic to utilize the existing bridge and roadway, minimizing traffic impacts to US 101.
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