North Mercer Island/Enatai sewer upgrade
Project update
May 4, 2022
Surveying continues/utility locates beginning in May
Starting as early as May 16, crews will locate utilities in north Mercer Island and Bellevue to prepare for major construction activities beginning later this Spring. Surveying and utility location will take place in neighborhoods, public parks, and along the I-90 trail. Most work will take place in the public right of way. King County will notify property owners ahead of any work on private property.
What to expect while crews are locating utilities:
- Permitted hours are 7 a.m. to 7 p.m. Monday to Friday and 9 a.m. to 6 p.m. on Saturday.
- We will provide advance notice of any weekend or after-hours work.
- Utility location is expected to take approximately one month to complete.
- Please note, construction schedules often change due to weather, staffing, and other unforeseen things.
- Flaggers will direct vehicle, pedestrian, and bicycle traffic around the work site, as necessary.
- Expect intermittent loud noise during jackhammering and saw cutting.
- Expect increased continuous noise while the vacuum truck is in use.
Learn more about utility location via our project update.
To learn more about what we are building, construction, and what to expect, click on the StoryMap below.
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North Mercer Island project area
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Project description
With over 400 miles of pipes moving wastewater to one of our award-winning treatment plants, King County WTD works hard to maintain our system. We inspect and monitor our regional system and update plans for needed upgrades.
King County WTD needs to replace sewer pipes that serve areas in North Mercer Island, the southwest portion of Bellevue near Enatai Beach, and the Town of Beaux Arts Village. This pipeline carries wastewater from the North Mercer Island Pump Station to the Sweyolocken Pump Station in Bellevue.
Learn more:
Schedule
Project design began in 2016 and will be complete in 2021. Construction is expected to begin in 2022 and extend until 2025. View March 2022 project newsletter for latest schedule .
Contact us
Contact Kristine Cramer, community services lead at:
NMEsewer@kingcounty.gov
206-477-5415
24-hour construction hotline: 206-263-1915
Project location
Back to the capital projects overview map .
Lets Talk Mercer Island!
The City of Mercer Island and King County are collaborating to ensure Mercer Island residents get timely, accurate construction information. In addition to the County’s website, Let’s Talk Mercer Island will feature the project with monthly updates and will monitor for resident questions and comments.
Related information
Local municipalities: