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Project update

October 2018

Exterior of the Rainier Valley Wet Weather Storage Facility

tree planting

The major parts of the construction project are now complete. We have installed landscaping and are finishing up the last touches on the equipment inside the facility. The tank will be ready to store excess sewage and stormwater in time for the rainy season this fall.


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Contact Caryn Sengupta at:


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To learn more about how we installed pipe under Rainier Ave. S. without having to close the road for long periods of time, watch this video on microtunneling.

Project description

This project will keep sewage and stormwater out of the Duwamish River. A new sewer pipe will be installed near the intersection of Rainier Avenue South and South Bayview Street to send sewage and stormwater from a pipe that gets full during storms to another pipe that has more room. 

A storage tank at the intersection of South Hanford Street and South 27th Avenue will catch any remaining extra sewage and stormwater to keep sewage and stormwater out of the Duwamish River. 

New and reused pipe at S. Bayview St.New and reused pipe at South Bayview Street (  , May 2014)

new storage tank at S. Hanford St.Underground storage tank at South Hanford Street (  , May 2015)

Project schedule

Project scheduleProject schedule (  , May 2015)