Tosh Creek Watershed Restoration Plan

Project Background


In December 2013, City Council adopted the Redmond Watershed Management Plan which evaluates and prioritizes Redmond's watershed basins and identifies priority basins for stormwater retrofitting and habitat restoration. The plan identified Tosh Creek as a high priority basin for retrofit.

As a result of this designation, the Washington State Department of Ecology is partnering with Redmond to fund development of the Tosh Creek Watershed Restoration Plan (Restoration Plan). 

Purpose of the Project


The City of Redmond (City) is committed to fully restoring Tosh Creek to make it healthy for aquatic life, and a valuable natural asset for the people who live, work, and play in Redmond. Using a watershed approTosh Creekach to achieve healthy aquatic habitat has been a long-standing policy detailed in the city's Comprehensive Plan and is recognized by stormwater and surface water restoration practitioners as the recommended approach to accommodate healthy streams in an urbanized landscape.

The Restoration Plan will identify potential stormwater retrofit and in-stream projects that will improve the hydrology and water quality of the stream and also mitigate flood hazards. There are five main areas of focus in this Restoration Plan.
  1. Flow Control (slow down stormwater flows to protect the stream)
  2. Water Quality Treatment (clean up stormwater runoff for cleaner water in the stream)
  3. Low Impact Development Infiltration (soak stormwater into the ground)
  4. Instream Work (repair damaged sections of the stream and add plants)
  5. Stormwater Infrastructure Repairs (repair or replace failing pipes)
Projects described in this Restoration Plan from each of these focus areas will form a capital improvement program that lays out a sequence of projects tailored to the prioritized needs that have been identified for the Tosh Creek watershed.

Community Benefits


Completion of the projects identified by this plan will:
  • Eliminate flooding in the neighborhood
  • Prevent erosion in Tosh Creek
  • Reconstruct stream channel segments to improve fish habitat
  • Remove invasive vegetation and re-plant bare portions of the stream buffer
  • Repair damaged stormwater pipes to avoid future flooding problems 
Ultimately, the combined suite of projects will restore the ecological health of the stream, bringing back larger populations of coho salmon, cutthroat trout, and other fish. This healthy stream will be a valuable asset for our community for generations to come! 

How to Stay Informed


Please visit this website for the most up-to-date information on the project. Additional materials and project information will be posted on the site as the project develops.

If you know of any flooding, erosion, or other drainage problems in and around Tosh Creek (see Vicinity Map below), let us know. This kind of information can influence the types and locations of future projects. Call, email, or complete the Report a Stormwater/Drainage Concern to report your drainage concerns.

Our next mailing is scheduled for late fall of 2014.

Project Data - Tosh Creek


Vicinity Map  (September 24, 2014)
Quality Assurance Project Plan  (November 2013)
Existing Conditions  (April 14, 2014)
Geomorphology  (April 14, 2014)
LID Feasibility  (April 14, 2014)
Drainage Issues Map  (September 24, 2014)
Stormwater Infrastructure Conditions Assessment  (September 24, 2014)
In-Stream Work Recommendations  (April 14, 2014)
Stormwater Retrofit Recommendations   (September 24, 2014)
Tosh Creek Projects Predesign Report
Watershed Restoration Projects - Five Year Plan 
2014 Winter Focus Article:  What's Next for Tosh Creek?

Project Phase: Planning and Predesign

Funding Sources:  City of Redmond Stormwater CIP and Washington State Department of Ecology Grant

Estimated Timeline

Analysis of Project Alternatives & Public Outreach:  Winter/Spring 2014
Project Identification:  Fall 2014
Seek Grant Funding for Projects:  Fall 2014
Design of First Year Project & Public Outreach:  Winter 2014-2015
Construction of Projects:  2015-2017
Plan Update:  2020


Contact: Steve Hitch, Project Manager, 425-556-2891