Circle River Ranch Flood Risk Reduction Project

Project overview

The Circle River Ranch neighborhood is located along the right bank of the South Fork Snoqualmie River, just downstream from the City of North Bend.

Flooding and channel migration of the South Fork Snoqualmie River threaten the Circle River Ranch neighborhood. The Circle River Ranch Flood Risk Reduction project identified and evaluated ways to reduce flooding risk to the neighborhood.

The project was prioritized as a near-term action in the South Fork Snoqualmie River Capital Investment Strategy (CIS). King County started work on the Circle River Ranch Flood Risk Reduction project on behalf of the King County Flood Control District (District) in October 2018. Project staff studied the existing conditions and put together a variety of alternatives, or options, to reduce flood risks.

In Winter 2021, the District selected a preferred alternative. Technical analysis and public feedback informed the District’s decision. A meeting recording of the Virtual Community Meeting and a summary of public comments are available below. 

Construction of the selected alternative was completed in October 2024. The project repaired damage to the upstream end of the existing revetment (at approximately 10119 416th Ave SE) through construction of a buried setback revetment, approximately the same length as the damaged area. This provides erosion protection to the properties downstream from the repair site.

Utilizing funds from the District, King County will also acquire at-risk homes from willing sellers to permanently reduce risks by getting people out of harm’s way.