 King County is getting ready to build a 1.25-million-gallon underground storage tank near the intersection of Southwest Michigan Street and Second Avenue Southwest. This storage tank and supporting infrastructure underneath West Marginal Way Southwest will reduce combined sewer overflows from the South Park drainage basin into the Duwamish River. We anticipate the start of construction in Spring 2025.
Find the King County team at community events this August to learn more about the project and what you can expect during construction.
18th Annual Duwamish River Festival, August 3, 2024
Join us for the 18th Annual Duwamish River Festival on Saturday, August 3, from 12 p.m. to 5 p.m. at Duwamish River People’s Park and Shoreline Habitat (8700 Dallas Avenue South, Seattle). Duwamish River Festival features free food, family-friendly activities, arts, culture, advocacy and entertainment to celebrate a healthy Duwamish River.
The West Duwamish Wet Weather Storage project team will host a table with other King County project teams to share information about our commitment to the Duwamish River. To learn more about the event and how to volunteer visit the event website at https://www.drcc.org/duwamish-river-festival-
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SOPASUPA summer Party, August 17, 2024
The project team will host an information booth at the SOPASUPA Summer Party on Saturday, August 17, from 12 p.m. to 5 p.m. at the intersection of South Cloverdale Street and 14th Avenue South (8601 14th Avenue South, Seattle, WA, 98108). SOPASUPA is a neighborhood party with live bands, lucha libre performances, a zone for kids, a swap meet market, and much more! Find our project team to learn more about our commitment to community and how we plan to keep you informed during construction.
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Project schedule
 Questions?
Contact Demmelash Adera at 206-263-2340 or email deadera@kingcounty.gov
Visit the project website to learn about the project and the survey route map at kingcounty.gov/westduwamish-cso
We will provide an interpreter at no cost.
Alternative Formats Available: 206-477-5371 or TTY Relay: 711
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