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Projects

Find information about current and planned future Mouth of Duwamish Wet Weather Facilities projects.

April 2024 update

Upcoming survey work in the SODO neighborhood

King County is conducting survey work at several sites in the SODO neighborhood in April 2024. This work will help our team to learn about underground soil conditions and above ground building, roadway, sidewalk, vegetation, and utility locations as we progress our plans to reduce overflows from five combined sewer outfalls where the Duwamish River meets Elliott Bay.

What to expect

  • Work hours 7:30 a.m. to 5 p.m. daily for approximately one month, starting as early as March 25, 2024.
  • Work will take place for several hours at each location. We expect to be at each location for about one day.
  • Work may involve temporary lane, shoulder, or sidewalk detours, noise, and slight vibrations. If detours are necessary, flaggers will be on site to assist vehicle and pedestrian movement. Detours will not be concurrent, and each will last up to eight hours.

Please watch for equipment and signs in the area, travel slowly to stay safe and follow direction from flaggers.

*Each dot on the map represents up to two survey locations/Cada punto en el mapa representa hasta dos ubicaciones de la encuesta

The Mouth of Duwamish Wet Weather Facilities are in the planning phase. For more information, check out the factsheet.

View translated documents and content in Español  (Spanish), 中文  (Chinese, simple),  正體字  (Chinese, traditional), and  ខ្មែរ (Khmer).

Sign up for our project email list using the link on the right side of this webpage.

Questions?

Contact Bibiana Ocheke-Ameh at 206-477-5604 or bibiana.ocheke-ameh@kingcounty.gov

Project description

King County is currently evaluating methods to reduce overflows from 5 combined sewer outfalls (shown on the map below) in accordance with Washington State law and the federal consent decree. These methods may include storage, treatment, or conveyance and will result in a variety of future projects.

During the planning phase, the project team will recommend an approach to control CSOs that considers a number of factors including regulatory, cost, environmental, and community priorities. King County’s regulators will review and approve plans before the projects move into design and construction.

We anticipate planning to end in fall 2025, with design and construction of projects associated with the Mouth of Duwamish Wet Weather Facilities to immediately follow.

 

The five King County outfalls included in this planning process are located in the east and west waterways of the Duwamish River on both sides of Harbor Island and along the shoreline of Elliott Bay generally in SODO.

King County is seeking to understand the feasible options to control pollution from these outfalls and meet regulatory and environmental requirements.

Community outreach

For information about community outreach, visit the Mouth of Duwamish Wet Weather Facilities public engagement webpage.

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