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January 2026
The Sammamish Plateau Diversion Project reaches the first milestone
We are launching outreach in 2026 with an important update on the Sammamish Plateau Diversion Project. The project team has identified a path for a new wastewater pipe in the northeast Lake Sammamish area. This new pipe will address wastewater capacity needs in the Lake Sammamish Area.
After careful study of the project area, the team identified a path, or project corridor, mostly along East Lake Sammamish Parkway. The team concluded that this corridor can best meet operational goals while limiting impacts, risk, and cost.
Visit our online open house to see the project corridor in detail and learn what the team considered in the project area. The online open house is live until the end of February 2026. Visit as often as you like at kingcounty.gov/wtd/Sammamish-Plateau-Online-Open-House.
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Share your thoughts!
Now that we have a project corridor to share, we want to hear from you. What questions or concerns do you have? What do we need to know about how you use the area? Your local knowledge can help us to serve you better.
You can fill out a survey in the online open house. If you prefer to talk one-on-one, email us at SammamishPlateauDiversionProject@kingcounty.gov or call us at 425-537-7216.
The online open house will be offered in multiple languages, and translated versions will be available soon!
¡La sesión virtual abierta al público se brindará en varios idiomas y estarán disponibles pronto!
本次线上开放日活动将提供多种语言版本，翻译版本即将上线！
本次線上開放日將提供多種語言版本，翻譯版本即將上線！
온라인 오픈 하우스는 다양한 언어로 사용하실 수 있게 되며, 빠른 시일 내에 번역본도 제공될 예정입니다!
Виртуальный день открытых дверей будет проводиться на нескольких языках и совсем скоро переведенные версии будут доступны для вашего ознакомления!
このオンラインオープンハウスでは、多言語サービスを提供しております。また翻訳版も間もなくご利用可です。
Upcoming survey work in East Lake Sammamish Parkway
The project team is continuing survey work in the right-of-way along East Lake Sammamish Parkway. Previous survey work in the City of Redmond was completed in 2025. Upcoming work is in the City of Sammamish.
Most survey work will occur on the shoulders of East Lake Sammamish Parkway Monday-Friday, between 7 a.m. and 3:30 p.m. This work involves no traffic impacts. Please watch for our survey crews and drive carefully in the area.
Crews will need to work in the roadway for some utility surveys. This work will take place at locations along East Lake Sammamish Parkway and at the Northeast Inglewood Hill Road intersection. Work in the roadway will occur on Saturdays from 6 a.m. to 9 a.m. to reduce traffic impacts. We will notify the community in advance of Saturday work and provide more detail on what to expect.
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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