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Project update

February 27, 2018

King County’s project in Magnolia is coming to a close. The County’s contractor conducted inspections of the newly installed pipe as King County’s Operations crews prepared the storage facility and associated equipment for operations. The plug preventing flows from entering the pipe was removed in late December 2018 and the pipe is ready to take flows during large storms. King County Operations will monitor operations of the facility and inspect the pipe again after the rainy season.

For more information on current progress, see our latest update .

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Magnolia Wet Weather Storage FacilityThe Magnolia Wet Weather Storage Facility at Smith Cove is designed to store excess flows of stormwater and sewage. The facility’s 1.5 million-gallon underground storage tank will help keep sewage and stormwater out of Puget Sound during storms.

King County is Protecting our Waters

This project is part of King County’s Protecting our Waters program to prevent pollution caused by excess stormwater in the sewer system on rainy days.

Combined sewer overflows (CSOs) are relief points in older sewer systems that carry sewage and stormwater in the same pipe. When heavy rains fill the pipes, CSOs release sewage and stormwater into rivers, lakes, or Puget Sound.

King County and the City of Seattle are working together to control CSOs and keep sewage and stormwater out of local waterways.

construction phase

Who do I contact?

Monica Van der Vieren:

24-hour construction hotline: 206-205-5969

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