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January 2026
Translations for the online open house and survey are available! Deadline to participate extended through March
The Sammamish Plateau Diversion Project team invites all community members to access information about the project and participate. We want to make sure we hear from everyone in the area. The online open house and survey is now available in seven languages. You may respond to the survey in your preferred language. Select links below to access the open house in the following languages:
With the launch of translated materials, we are extending the survey through March 31, 2026.
Debido al tiempo que tomó hacer la traducción, la sesión virtual abierta al público, al igual que la encuesta, permanecerán accesibles hasta finales de marzo.
由于翻译需要时间，我们将在线开放日和调查问卷延长至三月底。
由於翻譯所需時間，我們將線上開放日和問卷調查延長至三月底。
翻訳に必要な時間のため、オンラインオープンハウスとアンケートの締め切りを3月末まで延長します。
번역에 시간이 필요함에 따라 온라인 오픈 하우스와 설문 조사를 3월 말까지 연장합니다.
Из-за времени, необходимого для перевода, мы продлеваем онлайн-день открытых дверей и опрос до конца марта.
What we’re hearing: Questions about stream locations
As we send out updates, we will respond to questions we are hearing 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: Are the stream locations in your maps accurate? The stream near my home doesn’t look quite right.
King County’s response: People with streams on or near their property have pointed this out to us. They have shared information about stream locations and stream behavior in different conditions.
The maps in the online open house use King County stream data that is currently available. Available data may be out of date or inaccurate. This is especially true for creeks and streams. They may find new paths during flood events or naturally over time. Streams may also have been mapped prior to development in the area.
During the design phase, our project teams make sure we have current, accurate information. This means we need to assess streams and other features on site. This field research helps inform project design.
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This 3-dimensional map shows streams as blue lines. The streams flow down a steep, forested hillside. They cross under East Lake Sammamish Parkway and flow into Lake Sammamish.
Survey work continuing along East Lake Sammamish Parkway
Crews are continuing 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.
 Crews survey utilities along the shoulder on East Lake Sammamish Parkway.
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
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