North Mercer Island/Enatai sewer upgrade

General project updates

September 5, 2024

Project-wide updates

Check out our 2024 newsletter for an overview of this year’s progress and upcoming work. This newsletter is available in English, Español (Spanish), 中文 (Chinese, Simplified), and 正體字 (Chinese, Traditional).

Read the newsletter here to learn more

Crews are working extended Saturday work hours from 7 am to 7 pm in parts of the project area. Check out our June notification for more information.

Construction activity in Mercer Island*

Area 1. North Mercer Pump Station: Crews continue to upgrade the existing pump station. There may be intermittent single-lane traffic near the pump station for deliveries. For more information, check out the June Area 1 notification.

Area 2. North-central Mercer residential streets: Pipe repair work continues on 78th Avenue Southeast, Southeast 24th Street, and 81st Avenue Southeast. Expect periodic, single-lane traffic with flaggers until the work is complete.

Please use caution when traveling through the work area and follow all signage and directions from the crew. For more information, check out the August Area 2 notification.

Area 3. North Mercer Way: Crews installed pipe and paved North Mercer Way in 2023 and installed accessible curb ramps in spring 2024. For more information, check out past Area 3 updates.

Area 4. I-90 Trail: The I-90 trail is closed between Southeast 26th Street and Shorewood Drive for pipe testing and restoration. Paving for this section of trail is planned to begin as early as mid-September. It is expected to reopen later this fall once testing, paving, and restoration are complete. For more information, check out the August Area 4 notification.

The I-90 trail remains closed between Southeast 35th Street and Southeast 35th Place for pipe installation. Trail users should follow posted detour routes:

• Trail detour map between S.E. 26th St and Shorewood Dr. This takes trail users along North Mercer Way, before connecting back to the I-90 trail.
• Trail detour map between S.E. 35th St and S.E. 35th Pl. This takes trail users on East Mercer Way, Southeast 36th Street, and North Mercer Way, before connecting back to the I-90 trail.

For more information, check past Area 4 updates.

Area 5. 90th Pl S.E.: Paving on Shorewood Drive and the lower section of 90th Pl S.E. is complete. Crews continue work on the structures in the cul-de-sac at the top of 90th Pl S.E. For more information, check past Area 5 updates.

Area 6. NE Mercer Island:

Fruitland Landing: Fruitland Landing park is closed while crews upgrade Lift Station 11. Crews have installed new pipe on 97th Ave S.E. south of S.E. 34th St. Crews are preparing to reline the existing pipe on 97th Ave S.E. north of S.E. 34th St. Paving the south end of 97th Ave S.E. near the I-90 trail is planned for as early as mid-September.

S.E. 35th Pl: Crews continue to install pipe and structures on S.E. 35th Pl. Most residents will continue to access their homes from the temporary access road off Frontage Road. Paving on S.E. 35th Pl is planned to occur as early as mid-September. For more information, check out the August Area 6 notification.

I-90 trail: As construction continues on northeast Mercer Island, I-90 trail users should follow posted detour routes off the I-90 bridge trail. This takes trail users on East Mercer Way, Southeast 36th Street, and North Mercer Way. Trail users will then be able to connect back onto the I-90 trail. Drivers, please drive slowly and watch for cyclists on the roadway.

Mercer Island Boat Launch: Crews restored the Mercer Island shoreline in spring 2024. Construction equipment moved out of the parking lot in June 2024, and the parking lot is fully reopen for public use.

For more information, check past Area 6 updates.

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.

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Construction activity in Bellevue*

Area 7. Enatai Beach Park/Lake Washington’s East Channel: Crews began restoring the shoreline along Enatai Beach Park under the I-90 bridge in late July. Crews continue to work on pipes and structures near the swim beach and under the I-90 bridge. For more information, check out the July Area 7 notification.

Crews are preparing 108th Ave. S.E. near S.E. 34th St for final paving. Expect flaggers, single-lane traffic, and detours in this area through September. The intersection at 108th Ave S.E. and S.E. 34th St will be closed from approximately 9/12 – 9/17 and 9/23 – 9/25 for concrete removal and paving. When the intersection is closed, there will be a detour around the work area. Please drive carefully and follow all signage and instructions from crews when traveling through the area.

Area 8. Sweyolocken/Mercer Slough: The Sweyolocken boat launch and Mercer Slough connector trail is open for community use. Paving the road to the boat launch is expected to begin as early as mid-September. For more information, check out the July Area 8 notification.

* Construction schedules can change based on factors such as site conditions, weather, and material availability. Please check this website for updates.

Construction status

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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 September 1, 2024