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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

September 14, 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: N. Mercer Way closed between 81st Ave. S.E. and S.E. 26th St.  as early as September 25. For more details, see the latest update.

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 updateSee the updated pedestrian detour map.

Area 5. 90th Pl S.E.: Final stages of work begin on 90th Pl. S.E. including installation of pipes and paving. For more information, see the latest update.   

Area 6. NE Mercer Island: Work continues on N. Mercer Way and SE 35th St, SE 35th Pl, and the Mercer Island Boat Launch. Click here for past updates.

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: Construction in public areas at Enatai Beach Park started on September 11. For more details, 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 Fall 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