Sammamish Plateau Diversion

Project update

March 4, 2026

Survey work continues and expands

The project team continues to survey utilities along East Lake Sammamish Parkway in Sammamish. Currently, this work is on the north end of the parkway. Most survey work will occur on the shoulder on Monday-Friday, between 7 am and 3:30 pm. This work involves no traffic impacts.

Crews will also begin marking streams and wetlands along the project corridor later this month. This work will occur along Northeast Inglewood Hill Road and East Lake Sammamish Parkway, and on the northern part of the East Lake Sammamish Trail. Later this spring, crews will be surveying trees along the project corridor.

Please look out for our survey crews and drive or bike carefully in the area.

Learn more about this upcoming work and what to expect in our latest project update.

Visit our online open house and share your thoughts – available in seven languages!

Thank you to the thousands of people who have viewed the Online Open House! We appreciate everyone who has filled out a survey and shared questions, suggestions, and contacts for community groups. Your responses help us understand your concerns and serve the community better as we continue through design.

We’ve reached out to local businesses, homeowners associations, houses of worship, and community-based organizations to share information about the project. Who are we missing? Do you know an organization or group that should know about this work? We want to know!

Share with us any organizations or groups that should be in the loop. We want to hear from everyone!

The survey is open through March 2026. You can fill it out as many times as you like. It’s available in seven languages:

• English: Visit our online open house and complete the survey.
• Español (Spanish): Visite nuestra sesión virtual abierta al público y complete la encuesta en español
• 中文 (Chinese, Simplified): 访问我们的在线开放日并参与简体中文问卷调查 
• 正體字 (Chinese, Traditional): 访问我们的在线开放日并参与繁体中文问卷调查 
• 日本語 (Japanese): 日本語でのオンラインオープンハウスとアンケートをご希望の方 
• 한국어(Korean): 저희 온라인 오픈 하우스를 방문하셔서 한국어로 된 설문 조사를 작성해 주십시오 
• Русский (Russian): Посетите Виртуальный День Открытых Дверей и поучаствуйте в опросе на русском