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Project description 

King County is replacing sewer pipes that serve areas in North Mercer Island, the southwest portion of Bellevue near Enatai Beach Park, 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. Once installed, the new pipes will provide sewer service for 50 years or more. To learn more about the project overall, including what we are building, construction information, and what to expect, view our StoryMap.

To meet community needs, we broke the project up into 8 project areas, shown on the map. We provide updates about specific areas depending on where work is taking place.


General project updates

November 17, 2023

Project-wide Updates: Check out our Spring Newsletter for an overview of this year’s progress and upcoming work. Our newsletter is available in English, Español (Spanish), 中文 (Chinese, Simplified), and 正體字 (Chinese, Traditional). See the newsletter here for more.

Construction activity in Mercer Island* 

Area 1. North Mercer Pump Station: Work continues at the North Mercer Pump Station. Click here for past updates.

Area 2. North-central Mercer residential streets: Crews begin final restoration in this area. Click here for past updates.

Area 3. North Mercer Way: Striping and repaving was completed along N. Mercer Way. Click here for past updates. 

Area 4. I-90 Trail: The I-90 trail between 84th Avenue Southeast and Shorewood Drive is currently closed. For more information, see the trail closure update and tree removal update. See the updated pedestrian detour map.

Area 5. 90th Pl S.E.: Paving and restoration begins on October 5 on 90th Place Southeast. For more information, see the latest update.

Area 6. NE Mercer Island: I-90 Trail closing between North Mercer Way and S.E. 35th Place as early as Oct. 23. For more details, check out our recent notification.

Luther Burbank Park: Construction equipment and material storage coming to South Parking Lot as early as October 2. For more details, see the latest update.


Construction activity in Bellevue*

Area 7. Enatai Beach Park/Lake Washington’s East Channel: Nighttime work in the East Channel begins as early as November 14 through November 30. For more information, see the latest update

Area 8. Sweyolocken Pump Station: Work continues near the Sweyolocken Pump Station. The Mercer Slough connector trail is expected to remain closed through Winter 2023. See the I-90 trail bike and pedestrian detour map. Click here for past updates

Construction status

Construction status along the alignment of the North Mercer/Enatai sewer upgrade project. Click for larger view.

Revised September 1, 2023

*Please note that construction schedules often change due to weather, staffing, and other unforeseen things. Dates on email notices may differ from the dates posted on the web.

Previous general project updates

Project location