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July 2026
Read more about the Sammamish Plateau Diversion Project in our latest newsletter! Available online in seven languages
Now that the project is moving into early design, we have an updated newsletter to share! This includes information about:
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What we are doing during early design
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What we’re hearing from the community
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What you can expect during this phase
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How you can stay connected
We mailed this newsletter to over 10,000 neighbors in and near the project corridor. We also posted the newsletter online in seven languages. Check it out by clicking the buttons below!
If you have any questions or comments about the project, please reach out! We will also be at some community events over the next few months. We’d love to talk with you!
Meet us at an upcoming community event
We will be at events in Redmond, Sammamish, and Issaquah this summer and fall to answer your questions and collect your comments and feedback.
Upcoming events:
GoGreen Movie Night in Marymoor Park
Sammamish Farmer’s Market
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Date: Wednesday, August 5
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Time: 4 to 8 p.m.
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Location: Sammamish Commons, 801 228th Ave. Southeast
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Date: Saturday, October 3, and Sunday, October 4
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Time: 10 a.m. to 6 p.m.
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Location: Downtown Issaquah
We hope to talk with you soon!
Catch us at an upcoming community event to talk about this project and what we should know about this area!
morning field survey work on July 25
Project crews are collecting survey data along East Lake Sammamish Parkway Northeast and Northeast Inglewood Hill Road. This information will help inform where the new pipe could be located within the project corridor and construction methods. To learn more about the project corridor, visit the project’s Online Open House and click on the “Project Corridor” tab.
When: Morning of Saturday, July 25
Where: Along East Lake Sammamish Parkway Northeast, between Northeast 16th Street South to the intersection of Northeast Inglewood Hill Road (does not include the intersection)
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Work hours are from 6 to 9 a.m.
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Temporary traffic stoppage and minor delays
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Traffic signs, flaggers, and a truck with flashing lights
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Access to homes and Inglewood Parking lot will be maintained
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People on bikes will need to merge with traffic
 This map shows the approximate survey area in the yellow box. The survey work is planned to take place on East Lake Sammamish Parkway Northeast between Northeast 16th Street and Northeast Inglewood Hill Road.
The pipes and people that keep everything flowing
 WTD's conveyance inspection team conducts a routine inspection of a sewer line in Redmond.
Much of our regional sewer system dates back to the 1960s, with some structures more than a century old! Keeping it reliable takes routine inspection and maintenance. Crews follow a 10-year cycle to inspect every inch of pipe, building a record of how conditions change over time. Some sections are checked more often, about every three years, depending on age, material, or location.
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 though 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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