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February 2026
Visit our online open house and share your thoughts – available in seven languages!
Thank you to everyone who has visited the Sammamish Plateau Diversion Project online open house! We appreciate people who have taken the time to fill out a survey and shared thoughts and questions. Your responses help us understand your concerns and where we can provide more information.
The survey is open through March 2026. You can fill it out as many times as you like. It’s available in seven languages:
If you need accommodations to access this material or would like to share your thoughts with us directly, please contact:
Survey work continues along East Lake Sammamish Parkway
The project team continues to survey and mark utilities along the shoulder of East Lake Sammamish Parkway. Currently, this work is taking place on the north end of the parkway in the City of Sammamish. Crews are working Monday-Friday, between 7 a.m. and 3:30 p.m. This work involves no traffic impacts. Please look out for our survey crews and drive carefully in the area.
There will be occasional work in the roadway for some utility surveys. This work will take place on Saturday morning to reduce traffic impacts. We will notify the community in advance of Saturday work and provide more detail on what to expect.
What we’re hearing: Questions about combining the new wastewater pipe with existing pipes
As we send out updates, we are responding to questions from people who visit the online open house. We're compiling these questions and responses into a document, which we'll post on the project website.
Question: Can King County’s project combine the existing wastewater pipe in East Lake Sammamish Parkway with the new pipe?
King County’s response: No, the project cannot combine the new pipe with the existing pipes in the street. King County’s wastewater pipes run next to many local pipes throughout our service area. The County's regional lines connect with local lines at designated points.
King County code guides policies and actions for the Wastewater Treatment Division. County code prohibits private connections to the sewer system with few exceptions. Code restricts local connections to designated structures. Those connections must allow accurate metering and sampling.
Northeast Sammamish Sewer and Water District operates a pipe in the project corridor. This pipe collects wastewater from more than 50 private connections along East Lake Sammamish Parkway. These private sewers represent uncontrolled connections and must be connected to the Northeast Sammamish Sewer and Water District pipe. Private sewers are not allowed to connect to the County’s new pipe. It is not feasible to combine local and regional flows in these circumstances.
We're here for you!
We know that large construction projects can be stressful for communities, and there are a lot of construction projects going on across the Eastside. Our project team is committed to being available and continuing to work with neighbors, businesses, visitors, and commuters every step of the way. We will be here for you all the way through design and construction and into operations. Feel free to contact us at any time!
Contact us
Community Services Project Team
Visit us at kingcounty.gov/SammamishPlateauDiversion
Please note that voicemails and emails are considered records and may be subject to public disclosure. The project phone number is operated by a third-party service called Grasshopper. Recordings on this service are considered records. If you prefer to discuss the project with us rather than commenting in voicemail or email, please leave a message and we'll call you back within one business day.
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