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Lake Hills and NW Lake Sammamish sewer upgrade

The Lake Hills and NW Lake Sammamish Sewer Upgrade Project will upgrade 4.5 miles of sewer pipes serving the growing Redmond and Bellevue area.

Project description

The Lake Hills and NW Lake Sammamish sewer pipe has been serving Redmond and Bellevue for 50 years, carrying wastewater to Brightwater Treatment Plant in Woodinville for treatment. King County is working on a project to upgrade 4.5 miles of this sewer pipe to meet the growing needs of the community. King County will build the new pipe in trails, roads, and parks in Redmond.

Construction on the project is expected to begin in 2024 and may impact your daily routine. When the project is complete, the new pipe will provide sewer service for 50 years or more.

Project update

September 2023

That’s a wrap for summer outreach!

As summer comes to an end, we want to give a special thank you to all who visited us during Bike Everywhere Day, Redmond Derby Days, the BECU GoGreen Movies at Marymoor, and the Move Redmond Open Streets Festival. It was a pleasure to chat with you all! To find more detailed information about what we heard at each event, view the event summaries on our public engagement page.

This view shows a section of the detour between NE Leary Way and SR 520. A barrier will separate northbound vehicle traffic from bikes traveling southbound. The shared use path will be for northbound bikes and for trail users.One highlight from our summer outreach was that we were able to share information about our Sammamish River Trail detour update. When construction starts, King County’s contractor will close sections of the SRT between NE 85 Street and NE 51 Street. To see how the detour will help safely organize vehicle traffic and trail-users along West Lake Sammamish Parkway between NE Leary Way and NE Marymoor Way, view the detour update information from our most recent listserv. Be sure to sign up for our listserv to receive project updates as we finalize design!

Interested in a project briefing for your community group?

We are happy to meet with you or come to your next community event to share the latest project information and to answer questions you might have as we get closer to construction. Please contact Annie Pfeifer at 206-263-3203 or for more information.

Sign up for project text alerts

Be sure to sign up for project updates to stay up-to-date on the latest project information and upcoming events. You can also get updates from your phone. To sign up for text alerts, text KING REDMONDSEWER to 468-311.

Previous project updates

Project location