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Project update

December 4, 2017

We want to hear from you! Visit the online open house between now and Jan. 31 to share your feedback on our project design.

During early design, we heard the following from you:

  • Limit disruptions to West Lake Sammamish Parkway and the Sammamish River Trail; find safe, efficient detour routes for those driving, cycling or walking along these routes
  • Maintain access to Marymoor and Idylwood parks and the Sammamish River Trail for recreation, especially during the busy summer months
  • Identify and avoid sensitive plant and animal habitats in the area
  • Reduce work on private property
  • Coordinate with Audubon Elementary School and limit construction near the school during the school year
  • Coordinate with the City of Redmond and Sound Transit on other projects in the area, including the Redmond Central Connector and the East Link Extension

We’ve worked to incorporate this feedback into our latest designs.

How did we do and what else should we be thinking about?

The online open house for the Lake Hills/NW Lake Sammamish Sewer Upgrade Project will be open until January 31, 2018. Please stop by to review and comment on the latest maps of the sewer alignment, trail closure and detour information, traffic implications for West Lake Sammamish Parkway, environmental considerations, and more.

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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.


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Project description

The Lake Hills and NW Lake Sammamish sewer pipe has been serving Redmond and Bellevue for 50 years. The water you use travels down your drain to City sewer systems. The City’s pipes send wastewater to King County’s sewer system where it is carried to the Brightwater Treatment Facility in Woodinville for treatment.

King County is upgrading nearly 4.5 miles of sewer pipe in Redmond to meet the needs of your growing community. Construction is expected to begin in 2020. While the sewer pipe is under construction, King County will also install 1.5 miles of pipe to carry recycled water. When complete, the new pipes will provide reliable sewer service and an important connection for the potential future use of recycled water in the area.

Project timeline

Project timeline


Project location

project location

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