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King County North Mercer Island Enatai Sewer Upgrade Project




March 2025






Portions of I-90 Trail on North Mercer Island to close for repair work as early as March 10

Expect pedestrian and bike detours on North Mercer Way





*As early as March 10*, crews will be working on the I-90 Trail between 84th Avenue Southeast and Shorewood Drive and between Fortuna Drive and Southeast 35th Street on Mercer Island. This work is permit dependent and is pending approval from the City of Mercer Island.

 

*Closure*

Crews will be working in multiple areas at a time and need to close the *I-90 Trail between 84th Ave S.E. and Shorewood Dr. and between S.E. 35th St and Fortuna Dr*. to safely complete this work. While the trail is closed, please follow the posted trail detour route along North Mercer Way. Crews will begin this work by potholing areas along the trail and then proceed to repair the pipes in the trail.

 

*Detour*

During this work, the pedestrian detour will be routed along a temporary gravel path while cyclists will be detoured to merge with traffic along N. Mercer Way and follow I-90 trail where routed (see map below). Please follow all detour signs and travel slowly around the work area.

 

*Please follow marked detours and signs. Drivers should use extreme caution while moving through this area.*

 
Map of portions of the I-90 Trail that will be closed for pipe repairs

"Map of work areas with pedestrian and bike detours. Portions of the I-90 Trai""l will be closed for pipe repair work between 84th Ave S.E. and Shorewood Dr. and between S.E. 35th St and Fortuna Dr. The portion of the trail between S.E. 35th St and S.E. 35th Pl will remain closed. Please follow marked detours and travel slowly around the work area."

 

*Why is repair work needed? *

Testing the pipe ensures the newly installed conveyance system operates as planned. Pipe testing revealed an issue that needs repairs. Crews are repairing the pipe to make sure the system operates correctly and safely to ensure reliable sewer service for your community.

 

We understand that these detours are inconvenient. We appreciate your patience as we work to complete construction as safely as possible. If you have questions about access, please call our construction hotline at 425-305-3578.

 

*Plans for final restoration*

When pipe repairs are complete, crews will backfill the trail and temporarily restore the surface where the pipe was installed. Then, crews will restore all disturbed areas based on permit conditions agreed upon with the City of Mercer Island. Final paving is weather dependent and will take place during the next permitted paving window, which begins in the spring.






What to expect:

* Approved work hours are 7 a.m. to 7 p.m. Monday to Saturday.
* Speed limits on North Mercer Way will reduce to 20 mph near the work area.
* All work will be performed in the public right-of-way.
* Noise, dust, and vibrations typical of an active construction project.
* Emergency vehicle access will be maintained.
* Garbage, recycling, composting, and mail service will be maintained.
* If services are interrupted, please call the project hotline at 425-305-3578.

* Construction schedules can change based on factors such as site conditions, weather, and material availability. Please visit the project website [ https://vmm0dj30.r.us-east-1.awstrack.me/L0/https:%2F%2Fkingcounty.gov%2Fen%2Fdept%2Fdnrp%2Fwaste-services%2Fwastewater-treatment%2Fcapital-projects%2Fnorth-mercer-island-enatai-sewer-upgrade%2Ftranslations/1/010001913952d613-0d0514d1-01fa-40a4-ba2e-584ead673c46-000000/HM1IQHpE7T7OxQMfuEI9BFROV6Q=386 ] for updates.

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Learn more about this project

* Contact the community services team at 425-305-3578 or email NMEsewer@kingcounty.gov
* Visit the project website: kingcounty.gov/MercerEnataiSewer [ https://kingcounty.gov/depts/dnrp/wtd/capital-projects/active/north-mercer-island-enatai-sewer-upgrade.aspx ].
* Alternative Formats Available: 206-477-5371 or TTY Relay: 711  





*Sign up for location-specific email lists on our website.* [ https://kingcounty.gov/en/dept/dnrp/waste-services/wastewater-treatment/capital-projects/north-mercer-island-enatai-sewer-upgrade/update-sign-ups ]






Los servicios de interpretación y traducción están disponibles para usted sin costo alguno. Si los necesita, comuníquese con NMEsewer@kingcounty.gov, 425-305-3578

 

免費為您提供口譯和筆譯服務。如果您需要這些服 務，請聯絡 NMEsewer@kingcounty.gov, 425-305-3578

 

免费为您提供口译和笔译服务。如果您需要这些服 务，请联络 NMEsewer@kingcounty.gov, 425-305-3578








About King County Wastewater Treatment Division

The King County Wastewater Treatment Division protects public health and the environment by collecting and cleaning wastewater while recovering valuable resources for a thriving Puget Sound region. We provide services to 18 cities, 15 local sewer districts, the Muckleshoot Indian Tribe, and nearly 2 million people across a 424-square-mile area in King, Snohomish, and Pierce counties.

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