Sammamish Plateau Diversion

Project update

May 12, 2026

Visit us at Bike Everywhere Day on May 13!

Our project team will host a station as a part of Cascade Bicycle Club’s Bike Everywhere Day event on Wednesday, May 13, from 7 to 10 am. We want to hear from you! Stop by our station to learn about the project and share what’s important to you about this area. We’ll be on the north end of the East Lake Sammamish Trail near the Whole Foods in Redmond. We look forward to connecting with you soon!

Read our recent project email for more details.

Survey work continues in the project corridor

Project crews continue collecting survey data along the project corridor. This information will help inform the pipe location within the corridor and construction methods. Interested in learning more about the project corridor and sharing your input? Visit the project's Online Open House and click on the "Project Corridor" tab.

You can expect to see crews doing the following activities:

Marking utilities along East Lake Sammamish Parkway Northeast

Crews are working in the shoulder, which does not affect traffic. During this work, crews are working Monday through Friday, between 7 a.m. and 3:30 p.m. 

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

Surveying trees

Crews will be surveying and assessing larger trees along the project corridor. You may see numbered tags on some trees. Tags help in assessment and do not mean future impacts to the trees. The project team will work with public or private property owners if trees will be affected. Tree surveys will not impact traffic.

Read our recent project email to learn more about ongoing survey work in the area.

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Thank you for visiting our Online Open House and sharing your thoughts!

After three months and over 8,000 views, we’ve wrapped up the Online Open House. You will still be able to continue viewing this product as a resource and fill out the survey on our Public Engagement page. Later this spring, we will share a summary of what we heard.

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 during the project’s design and construction phases.