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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

March 26, 2024

Project-wide Updates: Crews with unique expertise in underwater construction are placing pipe under the East Channel of Lake Washington. Read the news release and watch the video about this construction activity.

Construction activity in Mercer Island* 

Area 1. North Mercer Pump Station: Work continues at the North Mercer Pump Station. For more details on what to expect over the next few months, check out our recent notification

Area 2. North-central Mercer residential streets: Maintenace hole work was completed at the Pump Station. Check out past Area 2 updates here.

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

Area 4. I-90 Trail: The I-90 trail is closed for pipe installation between Southeast 26th Street and Shorewood Drive and between Southeast 35th Street and Southeast 35th Place. For more information please review our recent Area 4 updates.

Click here for the trail detour map between S.E. 26th St and Shorewood Dr.

Click here for the trail detour map between S.E. 35th St and S.E. 35th Pl.

Area 5. 90th Pl S.E.: Guardrail installation at 90th Pl SE was completed. Check out past Area 5 updates here.

Area 6. NE Mercer Island: As construction activity near East Mercer Way and S.E. 35th Pl. increases, I-90 trail users should continue following our trail detour route off I-90 bridge trail. Drivers, please drive slowly and watch for cyclists on the roadway.

Crews continue installing pipe on S.E. 35th Pl. Starting as early as April 1, S.E. 35th Pl. will be closed between El Dorado Drive and East Mercer Way for approximately one month. Check out our recent notification for more information.    

Trenchless pipe installation continues at the south end of 97th Avenue Southeast. Crews have completed installation along the west side of the street. As early as March 19, work will begin on the east side of the street. Check out past notifications here.

Pipe installation and structural upgrades are coming to Lift Station 11 at Fruitland Landing and to 97th Avenue Southeast. Major activities are planned to begin mid-March. For more details, check out our recent notification

Luther Burbank Park: South Parking Lot currently closed due to construction equipment and material storage. For more details, see the latest update.

 


Construction activity in Bellevue*

Area 7. Enatai Beach Park/Lake Washington’s East Channel: Shoreline restoration begins near the Mercer Island Boat Launch, with barges leaving the East Channel by end of March. For more details, check out our recent notification.

Area 8. Sweyolocken/Mercer Slough: Work continues near the Sweyolocken Pump Station and the Mercer Slough Boat Launch. The Mercer Slough connector trail is expected to reopen Spring 2024 with a temporary closure as early as June for repaving. Here is the current Mercer Slough trail detour map. Click here for past Area 8 updates

Construction status

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Revised December 4, 2023

Previous general project updates

Project location

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