South Magnolia CSO Control Project
August 27, 2014 Update -
King County’s contractor is continuing work on 32nd Avenue West to prepare for installation of a new gravity sewer pipeline that is a component of the new CSO facility in the Smith Cove area. Crews are currently preparing for drilling operations scheduled for this fall.
King County’s contractor is waiting for a permit from the City of Seattle to start shoring work to construct the drill pit on the east side of 32nd Avenue West. This work could begin any day and will be noisy. During this work, expect increased construction activity on the street.
Normal work hours begin at 7:00 a.m. and may extend up until 8:00 p.m. Traffic revisions are in place, and people should drive slowly through the project area here and watch for workers, other pedestrians, bikes and cars.
South Magnolia CSO basin project area
How will the new CSO facility work? View animation.
South Magnolia basin and project location.
King County is building a new gravity sewer pipeline and an underground storage tank in Magnolia. This facility will store peak combined sewer flows so that discharges of untreated wastewater and stormwater are limited to no more than one per year on a long-term average.
Why does King County need to do this project?
This project is included in a federal consent decree that requires completion by December 2015.
View meeting calendar for upcoming public meetings, and South Magnolia CSO Control Project Timeline (PDF), updated May 2013.