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photo of south fork snoqualmie river near circle river ranch neighborhoodThe South Fork Snoqualmie River near Circle River Ranch

Project area 

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.

map of circle river ranch project on the south fork snoqualmie river 2018


Flooding and channel migration associated with the South Fork Snoqualmie River threaten the Circle River Ranch neighborhood. The Circle River Ranch Flood Risk Reduction project will identify and evaluate flood and channel migration risk reduction measures to reduce risks to the neighborhood.

The Project was prioritized as a near-term action in the South Fork Snoqualmie River Capital Investment Strategy (CIS). The CIS identified near, medium, and long-term actions to address a range of critical flood and erosion risks along the River. In July 2017, the King County Flood Control District’s (FCD) Executive Committee approved the CIS as policy guidance.

This project will consider the opportunities and constraints associated with various risk reduction measures, including gravel management, structures to deflect river flows, and bank stabilization. Following an alternative analysis of potential solutions, a preferred risk mitigation strategy will be identified for design development and implementation.

The evaluation of potential solutions to address channel migration and erosion hazards will build upon previously completed work including the Circle River Ranch Geomorphic Hazards and Risks Assessment and Alternatives Analysis (Herrera 2012), and the Technical Memorandum Circle River Ranch Geomorphic Conditions, Hazards and Risks Update (Tetra Tech 2015).

Project goals

The actions identified in the South Fork Snoqualmie River CIS were guided by the four goals established by the King County Flood Control District (FCD)(Resolution FCD2014-21.1).

  1. Reduce risks from flood and channel migration hazards.
  2. Reduce the long-term costs of flood hazard management.
  3. Improve the natural environment through sound and sustainable flood hazard management.
  4. Incorporate stakeholder and community values into the corridor planning process.

Public involvement

The King County Flood Control District encourages the community’s feedback and involvement in this project. The District will be reaching out to the Circle River Ranch neighborhood residents and stakeholders at key milestones to provide project updates and get feedback on the alternative analysis and selected alternative. Questions and comments are welcome at any time. New information will be available on this webpage as future public involvement efforts are scheduled.

Project timeline 

Milestone                                   Anticipated dates
Alternative analysis begins Fall 2018
Alternative analysis complete Summer 2019
Share analysis and get input Summer 2019
FCD selection of preferred alternative                             Late Summer 2019
Share selected alternative Late Summer 2019
Begin project design  2020 - 2022 

Project sponsor

The project is sponsored by the King County Flood Control District.

Project Documents

Project documents are available in Adobe Acrobat format. For help using Acrobat files, please visit our Acrobat Help page.

For more information or questions about the Circle River Ranch 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.