 Project map and rendering
King County will build a 1.25-million-gallon underground storage tank near the intersection of Southwest Michigan Street and Second Avenue Southwest to hold stormwater and wastewater that currently overflows into the Duwamish River during large storms. The water in the storage tank will then flow to the West Point Treatment Plant for treatment before it is safely released into Puget Sound. This storage tank will reduce overflows and pollution into the Duwamish River. The County will also build supporting infrastructure underneath West Marginal Way Southwest.
Read on to learn about opportunities to meet us in your community this summer, explore our new project resources, and find out what to expect leading up to construction.
Find us at upcoming events near you!
Join us at an upcoming event near you to meet the project team and learn what to expect as we get closer to construction.
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Wellness Tuesday (TODAY): Cultivate South Park and Seattle Parks and Recreation are partnering to host Wellness Tuesday events in the South Park neighborhood this summer. These events include a farmers market, information tables, games, and other family-friendly activities. Find us at this event on Tuesday, July 29, from 4:30 pm to 7:30 pm at South Park Plaza, 8456 Dallas Ave. S.
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South Park Summer Party (SOPASUPA): Cultivate South Park and the South Park Business District will celebrate the community through the annual SOPASUPA event. The event will include vendors, information booths, and activities. Join us Saturday, August 16, from noon to 8 pm in the South Park Business District.
Do you know of other events in your area? Let us know if you would like our team to join to share more information!
Explore our new project resources
Use the links below to learn more about this work and responses to questions we frequently hear from you! Translations available here.
What’s next
Preparing for construction!
We expect construction to start by early 2026 and continue through 2028. King County will share regular updates during construction to avoid surprises. We will monitor a construction hotline, deliver notices to near neighbors, attend community fairs and festivals, mail informational materials, send email updates, post on social media, and update our project website. Stay tuned for more!
 West Duwamish Wet Weather Storage project timeline.
Update on RainWise in your area
New neighborhoods are now eligible for RainWise! Eligible properties can get a cistern and/or rain garden installed through the RainWise program and receive a rebate paying up to 100% of the cost!
Questions?
Interpretation and translation services are available to you at no cost. If you need them, please contact Daniel Arauz at 206-437-6486 or daarauz@kingcounty.gov.
Alternative Formats Available: 206-477-5371 or TTY Relay: 711
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