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June 2026
Survey work continues in the project corridor
Project crews will continue collecting survey data along East Lake Sammamish Parkway NE and on NE Inglewood Hill Road. This information will help the pipe location within the 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.
Survey work on the parkway this Saturday morning
When: Morning of Saturday, June 13
Where: East Lake Sammamish Parkway between NE 28th Place and NE 18th Place
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Work hours are from 6 to 9 a.m.
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Temporary single-lane closures
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Traffic signs, flaggers, and a truck with flashing lights
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People on bikes will need to merge with traffic.
 A map of the approximate survey work area on Saturday, June 13, from 6 to 9 a.m.
Where: Along the shoulder of East Lake Sammamish Parkway NE, south of Weber Point. Crews are moving south toward NE Inglewood Hill Road. This work will not disrupt traffic.
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Crews working along the shoulder along the East Lake Sammamish Parkway NE
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Work hours Monday through Friday, 7 a.m. to 3:30 p.m.
Please look out for survey crews and drive or bike carefully in the area.
 This map shows the approximate location of current and upcoming survey work along the shoulder on East Lake Sammamish Parkway NE. This is the area on the parkway in the yellow box. Crews are working their way south.
Surveying and tagging trees
Beginning this summer, crews will survey and tag larger trees along the project corridor. These surveys will identify where trees are located within the project corridor. You may see numbered tags on some trees. Surveying trees provides information to inform project design and help reduce future impacts to trees. Tags help in assessment and do not mean
This work is taking place in our project corridor, mostly along the right of way of East Lake Sammamish Parkway Northeast and Northeast Inglewood Hill Rd. The project team will work property owners as needed to access trees. Tree surveys will not disrupt traffic.
An example of an identification tag you might see on some trees in the project area.
Over the course of this project, we’ve heard from community members about your questions, concerns, and what’s important to you in this area. This helps our project team better understand what we need to consider as we move into design. You’ve shared information with us in various ways, including:
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Conversations through emails and phone calls
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Responses to our community, business, and Online Open House surveys
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Discussions with community groups and organizations during one-on-one conversations and briefings
We’re documenting and tracking what we’re hearing and learning with the project team. As we compile community questions, we’re adding some of them to a new Community Questions webpage on our project website. We will update this webpage throughout the project.
Do you have a question that isn’t answered on the website? Contact our Community Services team! You can find our project email and phone number in the “We’re here for you” section below.
Members of the project team participated in Cascade Bicycle Club’s 2026 Bike Everywhere Day celebration. We hosted a station on the north end of the East Lake Sammamish Trail in Redmond. We had a great time talking with community members, hearing your feedback, and answering your questions. Thanks for stopping by on a rainy morning!
 A King County WTD representative shares project information with community members at Bike Everywhere Day, 2026.
The project team spoke with about 25 people. We heard questions and comments about various topics, including:
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How important the trail is for commuting, connecting to public transit, and recreation
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Potential construction impacts, such as trail detours and signage
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Where the new pipe will go
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Wastewater treatment process and system capacity
 A King County WTD representative discusses the project with two community members (and a few furry friends!) at Bike Everywhere Day, 2026.
We’ll be out at more events this summer and fall. Stay tuned as we share more details in future project emails!
Is there a community event you think we should be at? Would your community group or organization like a project briefing? Let us know!
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:
Emily Berry, Community Services Lead
SammamishPlateauDiversionProject@kingcounty.gov, 425-537-7216
Visit our project website at kingcounty.gov/SammamishPlateauDiversion
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