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Project Overview
Shake Mill Left Bank Revetment (revetment) is located along the left bank of the North Fork Snoqualmie River, and protects the 428th Avenue Southeast roadway and the North Fork Snoqualmie River Bridge from channel migration and scour hazards. This road provides a direct connection between approximately 240 homes north of the bridge and the City of North Bend to the south. It also serves several commercial and recreational activities including forestry operations and access to Alpine Lakes Wilderness trailheads.Shake Mill left bank site map
Flooding and channel migration associated with the North Fork Snoqualmie River threaten both 428th Avenue Southeast and the North Fork Bridge. Channel migration and ongoing erosion completely eroded a 400-foot section of the revetment over the last decade, compromising protection of the roadway and bridge. The rate of channel migration on the left bank has averaged 18 feet per year over the last decade at the apex of the bend, with a maximum of 70 feet lost in a single year. At this rate, continued channel migration will preclude a repair project on King County-owned property within two years, and will threaten the 428th Avenue Southeast and North Fork Bridge within 10 to 20 years. This project provided protection to the roadway embankment and bridge by constructing a setback revetment.

Shake Mill left bank revetment damageFIGURE 2: Revetment damage at North Fork Snoqualmie River and the 428th Avenue Southeast Bridge. 

Project Area

The Shake Mill Left Bank Flood Risk Reduction Project was located along the left bank of the North Fork Snoqualmie River.

Project Sponsor

Design and construction were funded by the King County Flood Control District, partner agencies and grants.  

Project Documents

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For more information about the Shake Mill Left Bank Flood Risk Reduction Project, please contact Gus Kays, Project Manager, King County River and Floodplain Management Section, Water and Land Resources Division, Department of Natural Resources and Parks.