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Circle River Ranch Flood Risk Reduction Project
This webpage includes an overview and anticipated schedule of the Circle River Ranch Flood Risk Reduction project. As the project is developed opportunities for public input will be included.
Construction update
Construction will begin on Sept. 10, 2024, and will take up to four weeks to complete.
- Work will take place Monday through Friday between 7 a.m. and 7 p.m. under noise guidelines for unincorporated King County.
- There may be noise during construction from trucks and equipment accessing the site along Southeast 103rd Place and 416th Avenue Southeast.
- Contractors are required to minimize dust to lessen impacts to adjacent property owners and residents.
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 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. Please visit the Online Open House for a meeting recording with closed captions.
A summary of the public comments is available
Construction of the selected alternative will begin in early to mid-September 2024 to repair 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 will provide 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.
What is a buried revetment?
A revetment is a structure built along a riverbank to prevent erosion. Revetments are usually built with rocks, wood, plants, and other materials. A buried, setback revetment is built in a trench set away from the river’s edge, and then covered with dirt. Native plants are added by the river to improve stability and provide habitat for fish and wildlife.
Project goals
- Provide erosion protection to properties downstream of the revetment.
- Reduce long-term costs of flood hazard management.
- Improve the natural environment through sound and sustainable flood hazard management.
- Incorporate stakeholder input into the selection of the project alternative.
Project schedule
| Activity |
Dates |
|---|---|
| Community engagement |
2019 to 2024 |
| Design and permitting |
2022 to 2024 |
| Construction |
2024 |
| Construction monitoring |
2024 to 2029 |
| Site monitoring |
Ongoing |