North Mercer Island/Enatai sewer upgrade

General project updates

June 28, 2024

Project-wide Updates: Extended Saturday work hours from 7 a.m. to 7 p.m. will begin in parts of the project area as early as June 29. These extended hours are expected to be in place through August. Check out our recent notification for more information.

Construction activity in Mercer Island*

Area 1. North Mercer Pump Station: Crews have been busy upgrading the North Mercer Pump Station. Check out our recent notification for more information.  

Area 2. North-central Mercer residential streets: Check out past Area 2 updates here. 

Area 3. North Mercer Way: Check our 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.: Paving on Shorewood Drive and the lower section of 90th Pl S.E. is complete. Check our past Area 5 updates here.

Area 6. NE Mercer Island:

Crews are paving and restoring the Mercer Island Boat Launch parking lot. Once paving is complete, the entire parking lot will reopen to Boat Launch users. Construction activities will continue near Frontage Road. When driving through the area, please use caution. Check out our notification for more information.

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

Crews continue installing pipe on S.E. 35th Pl. Detours on S.E. 35th Pl expected to remain in place through June. Check out our recent notification for more information. 

Single lane traffic on 96th Ave S.E. continues. Please follow flaggers and traffic signs when driving through the area. Pipe installation on 97th Ave S.E. will begin as early as July 22. Check out our recent notification for more details.

Luther Burbank Park: Construction equipment moved out of the South Parking Lot on May 15. This parking lot is now fully reopen for public use.  

Construction activity in Bellevue*

Area 7. Enatai Beach Park/Lake Washington’s East Channel: Parking and pathways reopen for public use for the summer as construction continues at Enatai Beach Park. For more details, check out our recent notification.

Single lane traffic on 108th Ave. S.E. near S.E. 34th St as PSE continues work on electrical conduits. Check out our recent notification for more details.

Area 8. Sweyolocken/Mercer Slough: The Sweyolocken boat launch and Mercer Slough connector trail is now open for community use!

Construction continues near the Sweyolocken Pump Station, boat launch, and trail. There may be intermittent closures and short delays for final paving and restoration activities. We will share more details about impacts. Click here for past Area 8 updates. 

Construction status

Click for larger view.

This map is updated as construction progresses across north Mercer Island and southwest Bellevue. It shows areas of planned construction, active construction, and post-construction restoration.

If you need this map in another format, please leave a voicemail on the project hotline at 425-305-3578 or call TTY Relay 7-1-1. Reasonable accommodations are available to you for free.

Map current as of June 1, 2024