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September 2025
Sammamish Plateau Diversion Project update
King County’s Sammamish Plateau Diversion Project team is continuing to conduct research as we look at options for new wastewater infrastructure in the east Lake Sammamish area. You may have seen crews earlier this summer as they surveyed the right-of-way (ROW) in the east Lake Sammamish area and just north of the lake in Redmond. This work helps us better understand the area and informs project options.
We anticipate more ROW survey work to happen in the east Lake Sammamish area this fall. As soon as work is scheduled, we will share more information. For the latest details and updates, please visit the project website and subscribe to project updates via text or email.
See you at Issaquah Salmon Days Festival!
Get ready for a spawn-tastic time at the Issaquah Salmon Days Festival on Saturday, October 4, and Sunday, October 5! Stop by the King County Department of Natural Resources and Parks booth, where you can meet and talk with members of the Sammamish Plateau Diversion Project team. We’ll also be joined by the fantastic teams from Noxious Weeds, , Coal Creek Sewer Upgrade Project, and Floodplains. We look forward to seeing you there!
For more details about the event, visit the Salmon Days website: https://www.salmondays.org/
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Ready… set… RAIN!
Are you ready for rainy season?
Fall is approaching, and we have some tips to help you prepare for the rainy season. Consider the following steps to keep you and your home dry and safe this season:
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Inspect your home: Check for cracks or damage in your foundation and walls to prevent water leakage.
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Maintain gutters: Clean out and repair your gutters so they function properly and direct rainfall away from your home.
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Secure landscaping: Keep your yard waste away from streets and gutters to prevent it from clogging the stormwater systems.
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Stay informed: Keep up with local weather updates, follow safety guidelines, and stock up on essential supplies when necessary
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Be prepared: September is National Preparedness Month—a perfect time to sign up for King County’s emergency alerts. The Emergency Management team is here to keep everyone in King County safe and in the know—no matter where you live, work, or wander.
Image of person cleaning leaves out of gutters.
Our Conveyance Inspection team recently added a sewer cleaning truck to their roster! This powerful truck uses filtered wastewater to blast away sediment, wipes (don’t flush them!), oils and grease (don’t put it down the drain!), and vacuums up the mess — all without interrupting service or needing to bypass flows.
Taking care of more than 380 miles of King County-owned sewer pipes extends the lifespan of aging infrastructure and keeps debris from costly damages to pumps and equipment downstream.
Stay involved
For many people who live, commute, and play in the east Lake Sammamish area, King County Wastewater Treatment Division is a new neighbor. Our team has started learning about this area’s history, what people cherish about this community, and what their priorities and concerns are.
You will have many opportunities to connect with us as the project moves forward:
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Take our survey to let us know how best to work with you during this project by visiting the links below. If you are a community member and a business, please take both surveys.
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Call or email us with your questions, comments, or concerns.
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Invite us to a meeting with your group or organization.
If you have additional suggestions for how best to work with you, please 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
Monica Van der Vieren,Community Services Lead
Monica.VanDerVieren@kingcounty.gov, 206-477-5502
Visit us at kingcounty.gov/SammamishPlateauDiversion
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