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Methodical project performance reviews help to inform future flood-reduction projects.

Senior Ecologist Kate Akyuz on the Sammamish River, where she is evaluating fish habitat associated with a beaver dam.

The River and Floodplain Management Section (RFMS) recently established an effectiveness monitoring program as a way to ensure that the actions and management alternatives King County undertakes are achieving their intended purpose.

The effectiveness monitoring program requires staff to conduct project performance reviews -- methodical examinations of capital projects to assess performance and identify maintenance needs. Staff then uses that information to guide adaptive management and future capital project design. These reviews compare post-project performance metrics to pre-project baseline conditions related to flooding and fish habitat. A review typically includes an assessment of project structures, flood protection performance, plantings, channel morphology and fish habitat.

Monitoring is a regulatory requirement for local, state and federal permit approvals, and RFMS's analyses and data demonstrate that we're meeting current permitting requirements. Our analyses also provide invaluable information to permitting agencies, enabling them to guide future projects and ensure limited public funds are spent appropriately.

Three general categories make up these project performance reviews:

  1. Standard Monitoring: Generally used to demonstrate permit compliance, standard monitoring provides a broad base of information that enables project managers to prove permit compliance or to evaluate whether project objectives were met.

  2. Enhanced Monitoring: Often mandated on larger, more complex projects, enhanced monitoring requires measurement of a suite of relevant attributes (water surface elevations, channel morphology, sediment routing, fish and wildlife habitats and riparian plants) over a long period of time.

  3. Special Investigations: These are targeted monitoring efforts meant to address specific questions or floodplain management methods.

For more information about King County's monitoring program, see Program and Project Effectiveness Monitoring Framework (January 2015) (PDF, 1.2 MB).

Reports and studies

Below are several project performance reports and/or studies conducted by RFMS staff or consultants.

Countywide studies

Third-Party Review of Projects Involving Large Wood Emplacements (December 2015) (PDF, 22 MB)

King County River Recreation Study (2013)

Green River Basin studies

Reddington Levee Setback Project Year 1 Monitoring Report (December 2014) (PDF, 1.2 MB)

Determining the Effects of Vegetation on Levee Structural Integrity on the Green River in King County Washington (September 2014) (PDF, 3 MB)

Cedar-Sammamish Basin studies

Cedar River Recreation Study (2010)

Cedar Rapids Post-Project Channel Change Evaluation (December 2013) (PDF, 12 MB)

Belmondo Revetment Enhancement and Lower Cedar River Fish and Aquatic Habitat Monitoring Report (September 2015) (PDF, 2 MB)

Sammamish River Salmonid Pre-Spawn Mortality Study Report (February 2016) (PDF, 7.4 MB)

Evaluating Habitat Availability and Juvenile Salmonid Use of King County Projects on the Cedar River (April 2022) (PDF, 40.8 MB)

(For help using Acrobat, please visit the Acrobat Help page.)


For questions about this page, please contact Kate Akyuz, senior ecologist with the King County River and Floodplain Management Section.