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Natural Resources and Parks

King County, Washington

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Nov. 18, 2010

Public invited to hear plans to upgrade the Fremont Siphon

Sewer line beneath the Ship Canal has served Seattle since the early 1900s

People seeking information about plans to upgrade an aging sewer line beneath the Lake Washington Ship Canal are invited to a public meeting hosted by King County’s Wastewater Treatment Division.

The meeting will take place:

Tuesday, Nov. 30
6 to 7:30 p.m.
Fremont Public Library
731 N. 35th Street, Seattle

Community members will have an opportunity to learn about the alternatives King County is considering to upgrade the Fremont Siphon, a 100-year-old sewer line that carries wastewater from north Seattle to King County’s West Point Treatment Plant in Discovery Park.

During heavy rains, this critical sewer line can carry up to 220 million gallons of wastewater a day across the Ship Canal. The West Point Treatment Plant’s maximum design capacity is 440 million gallons per day.

The north end of the siphon runs beneath a segment of the Burke-Gillman Trail near the intersection of Second Avenue Northwest and Northwest Canal Street in Fremont and the south portion rests beneath West Ewing Mini Park near the University of Washington Trail in Queen Anne.

The meeting will give people an opportunity to meet project staff, ask questions, and learn about how King County plans to work closely with the community to address potential project impacts such as parking and traffic, bicycle path detours, and temporary access limitations in recreational areas.

Additional information about the Fremont Siphon is available on the project website

For questions or to arrange reasonable accommodations for people with disabilities at the Nov. 30 meeting, please contact Monica van der Vieren at 206-263-3701,  711 TTY, or e-mail


People enjoy clean water and a healthy environment because of King County's wastewater treatment program. The county’s Wastewater Treatment Division protects public health, the environment and the economy by serving 17 cities, 17 local sewer districts and more than 1.5 million residents in King, Snohomish and Pierce counties. Formerly called Metro, the regional clean-water agency now operated by King County has been preventing water pollution for nearly 50 years.

Note to editors and reporters: Visit the WTD Newsroom, a portal to information for the news media about the Wastewater Treatment Division, King County Department of Natural Resources and Parks:

Related information

Fremont Siphon

King County Wastewater Treatment