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Why is WSDOT stabilizing a slope on US 101 north of the SR 107 interchange in Cosmopolis?
US 101 south of Cosmopolis was reduced to single lane due to chronic roadway settlement beginning in January of 2020. The highway sits on a pre-historic landslide, resulting in repeated lane closures and delays for travelers between Aberdeen and Raymond.
WSDOT geotechnical engineers have surveyed and recommended a repair to correct the more than 12 inches of roadway settlement by installing soldier pile walls. Previous lower-cost repairs have proven to only last a single season and not addressed underlying causes. This solution offers a more permanent repair in an effort to restore two travel lanes to US 101.
The End Result
A stabilized roadway will help secure the hillside, reducing the potential for roadway settlement and repeated lane closures.
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