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Project update

March 2017

Odor Control Facility takes shape in Fremont


Crews finished work on the project’s Queen Anne site and outside the odor control facility area in Fremont. The project is on track to be finished in late spring 2017.


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Project description

King County is replacing the Fremont Siphon, a major sewer pipe running under the Ship Canal between Fremont and Queen Anne. The new siphon will be located west of the existing siphon to reduce project risks and impacts to the community. Construction begins in early 2015 and will continue until early 2017. The old siphon will be decommissioned.

Project schedule

Project schedule

Project location

Fremont Siphon

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Fremont Siphon service area

Building the Fremont Siphon Tunnel, 1913. Photo provided by Seattle Municipal Archives  .