December 2025

Pipe repair work on 78th Avenue Southeast as early as January 5

Expect noise, vibrations, and alternating traffic during work hours

As early as January 5, crews will be repairing pipe at the north end of 78th Avenue Southeast. This work is expected to take about two weeks to complete. This schedule is weather-dependent and may take longer.

Crews will use a construction method called open-cut trenching. During open-cut construction, crews sawcut the roadway’s surface, remove asphalt, and dig down to the pipe. You may notice construction noise and vibrations during work hours.

Traffic impacts: During work hours, flaggers and signage will direct single lane alternating traffic through the work area. Drivers may experience brief delays and can expect to wait up to 15 minutes when traveling on 78th Ave SE. After hours, the roadway will be restored to two-way traffic. Please use caution while driving or cycling on rough roadways and over steel plates.    Local access: Residential access will be maintained at all times, but it may take crews up to 15 minutes to set up a safe surface for you to cross. We appreciate your patience as we work to complete construction as safely as possible. If you have questions or concerns about access, please call our construction hotline at 425-305-3578.

Map of repair work area on 78th Ave SE. Two-way traffic will be restored after hours.

Plans for final restoration:

When repairs are complete, crews will backfill the roadway and temporarily restore the roadway 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:

• Permitted work hours are 7 a.m. to 7 p.m. Monday to Friday and 9 a.m. to 6 p.m. on Saturday.
  
  • Work outside these hours will be done as approved by the City of Mercer Island.
• All work will be performed in the right-of-way.
• Flaggers will direct single lane alternating traffic during approved work hours.
  • Two-way traffic will be restored after approved work hours.
• Noise, dust, and vibrations typical of an active construction project. 
  • Expect intermittent loud noise during excavation.
• 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 for updates.

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.
• Alternative Formats Available: 206-477-5371 or TTY Relay: 711  

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