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Project area updates
Project updates related to the ongoing construction in work areas 1 through 8 for the North Mercer Island/Enatai Sewer Upgrade Project.
Project area map
Area updates
Click the desired area to view recent updates:
Area 1. North Mercer Pump Station
Recent update:
Area 1. past updates
- North Mercer Pump Station fire alarm testing as early as February 10, February 2025
- Crews have been busy upgrading the North Mercer Pump Station, June 2024
- What to expect at the North Mercer Island Pump Station over the next few months, February 2024
- Preparation activities for final repaving on residential streets will begin as early as August 28, August, 2023
- Utility work and preparation for paving beginning as early as August 14, August, 2023
- Expect construction activities near North Mercer Pump Station for the next month, June 2023
- Work on temporary pump station continues; Temporary generator running the week of June 12, June 2023
- Update: 24-hour closure at 78th Ave SE and SE 24th St intersection extended, March 2023
- Pipe installation progresses to SE 24th St as early as March 1, February 2023
- Construction continues on temporary pump station, January 2023
- November 29 Neighborhood Meeting Canceled, November 29, 2022
- Please join us on Tuesday, November 29, for a neighborhood meeting about the North Mercer Pump Station. November 22, 2022
- Temporary pump station construction begins; Pipe installation on SE 22nd St continues, October 2022
- Saturday work will ramp up across the project corridor, September 2022
- Pipe installation on SE 22nd St is underway, September 2022
- Upcoming construction activities at the North Mercer Pump Station, August 17, 2022
- Sewer line construction beginning as early as July 14. Expect increased noise, vibrations, and some driveway access interruptions on SE 22nd St, 78th Ave SE, and SE 24th. July 8, 2022
- Construction staging to begin at the North Mercer Pump Station starting next week, June 24, 2022
- Schedule Update: Tree removal in Mercer Island begins soon, June 14, 2022
- Schedule Update: Tree removal near North Mercer Pump Station starting in June, May 18, 2022
- Surveying continues/utility locates beginning in May, May 4, 2022
- North Mercer Pump Station pre-construction StoryMap - What you need to know as construction gets started, April 19, 2022
Area 2. North-central Mercer residential streets
Area 2. past updates
- Final paving and restoration activities planned on S.E. 22nd St, 78th Ave S.E., and S.E. 24th St as early as June 18, June 2025
- Pipe testing to begin at 78th Ave S.E. and S.E. 24th St, April 2025
- 24-hour intersection closure at 78th Ave S.E. and S.E. 24th St planned to begin March 5, February 2025
- Update: Pipe repair work on 78th Avenue Southeast continues into early 2025, December 2024
- Pipe repair work on 78th Avenue Southeast at Southeast 22nd Place down to Southeast 24th Street, October 2024
- Utility potholing work on 78th Avenue Southeast between Southeast 22nd Place and Southeast 24th Street, October 2024
- Work continues on 78th Avenue Southeast, Southeast 24th Street, and 81st Avenue Southeast, August 2024
- Gasket repair work as early as July 8 on 78th Ave Southeast and Southeast 24th St, July 2024
- Single-lane traffic on residential streets near the North Mercer Pump Station and Mercer Island Park and Ride, May 2024
- Maintenance hole work will begin as early as February 2 on 78th Ave SE, SE 24th St, and 81st Ave SE, February 2024
- North Mercer Way closed between 81st Avenue Southeast and Southeast 26th Street as early as September 25*, September 2023
- Preparation activities for final repaving on residential streets will begin as early as August 28, August, 2023
- North Mercer Way closed between 81st Avenue Southeast and Southeast 26th Street as early as August 21, August, 2023
- Utility work and preparation for paving beginning as early as August 14, August, 2023
- Grinding and permanent paving on 81st Avenue Southeast and North Mercer Way starting June 27, June 2023
- UPDATE: Changes to traffic control and planned detours for the North Mercer Way closure, June 2023
- Pipe installation on North Mercer Way moves toward Island Crest Way, June 2023
- Pipe installation on North Mercer Way continues; 81st Avenue Southeast at North Mercer Way will partially reopen as soon as June 7, June 5, 2023
- Construction on North Mercer Way starting May 15th; Expect closures and detours throughout this work, May 2023
- UPDATE: Construction on North Mercer Way starting as early as May 8th, April 2023
- Construction on North Mercer Way starting as early as May 1; Expect closures and detours throughout this work, April 2023
- UPDATE: 81st Avenue Southeast fully closed starting April 10th for pipe installation, April 2023
- Update: 24-hour closure at 78th Ave SE and SE 24th St intersection extended, March 2023
- Update: 78th Ave and SE 24th intersection closed 24-hours a day for pipe installation, March 2023
- Pipe installation progresses to SE 24th St as early as March 1, February 2023
- Repair completed for residential gas line on 78th Ave SE, December 28, 2022
- November 29 Neighborhood Meeting Canceled, November 29, 2022
- Pipe installation progresses to 78th Avenue Southeast, November 2022
- Temporary pump station construction begins; Pipe installation on SE 22nd St continues, October 2022
- Saturday work will ramp up across the project corridor, September 2022
- Pipe installation on SE 22nd St is underway, September 2022
- Sewer line construction beginning as early as July 14. Expect increased noise, vibrations, and some driveway access interruptions on SE 22nd St, 78th Ave SE, and SE 24th. July 8, 2022
- Surveying continues/utility locates beginning in May, May 4, 2022
- North Central Residential Streets pre-construction StoryMap - What you need to know as construction gets started, April 19, 2022
Area 3. North Mercer Way between the Park and Ride and Island Crest Way
Area 3. past updates
- Final paving and restoration activities planned between 80th Ave S.E. and 81st Ave S.E. on North Mercer Way as early as June 23, June 2025
- Update: 24-Hour Road Closure on North Mercer Way between 80th Ave S.E. and Island Crest Way as early as May 6, May 2025
- Update: 24-Hour Road Closure on North Mercer Way between 80th Ave S.E. and Island Crest Way postponed, April 2025
- 24-Hour Road Closure on North Mercer Way between 80th and Island Crest Way as early as April 28, April 2025
- Single-lane traffic along North Mercer Way as early as April 22 for approximately three weeks, April 2024
- Construction equipment and material storage coming to South Parking Lot in Luther Burbank Park, September 2023
- Grinding and permanent paving on 81st Avenue Southeast and North Mercer Way starting June 27, June 2023
- UPDATE: Changes to traffic control and planned detours for the North Mercer Way closure, June 2023
- Pipe installation on North Mercer Way moves toward Island Crest Way, June 2023
- Pipe installation on North Mercer Way continues; 81st Avenue Southeast at North Mercer Way will partially reopen as soon as June 7, June 5, 2023
- UPDATE: Construction on North Mercer Way starting as early as May 8th, April 2023
- Construction on North Mercer Way starting as early as May 1; Expect closures and detours throughout this work, April 2023
- UPDATE: 81st Avenue Southeast fully closed starting April 10th for pipe installation, April 2023
- Temporary lane closure along North Mercer Way near Fortuna Drive as early as March 13, March 1, 2023
- Surveying continues/utility locates beginning in May, May 4, 2022
- North Mercer Way pre-construction StoryMap - What you need to know as construction gets started, April 19, 2022
Area 4. I-90 trail
Recent update
Area 4. past updates
- I-90 Trail between 84th Avenue Southeast and Shorewood Drive now open, May 2025
- Update: Sections of I-90 Trail on North Mercer Island to close for repair work as early as March 20, March 2025
- Update: Sections of I-90 Trail on North Mercer Island to close for repair work as early as March 17, March 2025
- I-90 Trail paving between 84th Avenue Southeast and Shorewood Drive begins next week, September 2024
- I-90 Trail paving planned for the end of August between 84th Avenue Southeast and Shorewood Drive, August 2024
- Two-day closure on I-90 trail near Covenant Shores as early as May 30, May 2024
- I-90 Trail Detour on Northeast Mercer Island, December 2023
- Updated Pedestrian Detour Map available, September 2023
- I-90 Trail closing between 84th Avenue Southeast and Shorewood Drive as early as Aug 14, August 11, 2023
- Tree removal beginning along North Mercer Way and I-90 trail, August 8, 2023
- I-90 trail closed between Southeast 26th Street and Shorewood Drive as early as July 10*, July 7, 2023
- Temporary lane closure along North Mercer Way near Fortuna Drive as early as March 13, March 1, 2023
- Landscape restoration begins on the I-90 Trail, February 17, 2023
- Landscape restoration begins, October 14, 2022
- Saturday work will ramp up across the project corridor, September 2022
- Schedule Update: Tree removal in Mercer Island begins soon, June 14, 2022
- Construction work on the I-90 trail will begin as early as June 8, June 2, 2022
- Surveying continues/utility locates beginning in May, May 4, 2022
- I-90 Trail pre-construction StoryMap - What you need to know as construction gets started, April 19, 2022
Area 5. 90 PL SE
Recent update
Area 5. past updates
- Paving on Shorewood Drive and lower section of 90th Place Southeast planned for May 28 and 29, May 2024
- Final paving on 90th Place Southeast & 89th Place Southeast planned for May 7-9, April 2024
- Guardrail installation at 90th Pl SE starts on March 4 for approximately three days, March 2024
- SCHEDULE UPDATE: Paving now planned for October 5 and 6, October 2023
- Join us this Thursday, September 28 at 4:30 pm to learn about paving activities on 90th Place Southeast, September 2023
- Paving beginning on 90th Place Southeast, September 2023
- Crews begin installing pipe on Shorewood Drive as early as May 19, May 2023
- Pipe installation on 90th Place Southeast to be completed as early as mid-June, April 2023
- Upcoming water service interruptions on 90th PL SE, February 17, 2023
- Schedule update and work on 90th PL SE, October 28, 2022
- Saturday work will ramp up across the project corridor, September 2022
- Water and sewer line relocation starting on September 13, September 9, 2022
- Expect construction crews and activity starting on 90th Place Southeast as early as July 18, July 14, 2022
- Surveying continues/utility locates beginning in May, May 4, 2022
- 90th Place Southeast pre-construction StoryMap - What you need to know as construction gets started, April 19, 2022
Area 6. Northeast Mercer Island
Recent updates
Area 6. past updates
- Retaining wall installation on S.E. 35th Pl as early as March 17, March 2025
- Portions of I-90 Trail on North Mercer Island to close for repair work as early as March 10, March 2025
- Maintenance hole work on 97th Ave SE beginning as early as February 3, January 2025
- PSE electrical work at intersection of SE 35th Place and E Mercer Way on January 23, January 2025
- Pipe work near Southeast 35th Place and East Mercer Way as early as January 6, January 2025
- Temporary paving and air vent line installation completed at Southeast 35th Place and East Mercer Way, November 2024
- Sewer shutoff near Fruitland Landing planned for October 23, October 2024
- Air vent installation as early as October 7, October 2024
- Utility potholing work on Southeast 36th Street by City Hall this week, September 2024
- Paving on Southeast 35th Place as early as mid-September, August 2024
- Overnight equipment removal at East Mercer Way onramp to I-90 Westbound July 18, 11 p.m. - 4 a.m., July 2024
- Temporary Frontage Road closure planned for evening of July 7 through July 12 ,July 2024
- Single lane traffic 96th Ave S.E. starting as early as June 10, June 2024
- Single lane traffic near Fruitland Landing starting as early as May 28, May 2024
- Mercer Island Boat Launch parking lot reopening in June, May 2024
- Puget Sound Energy repairing gas line on Southeast 35th Place near East Mercer Way, May, 2024
- Gas line repair underway on Southeast 35th Place near East Mercer Way, May, 2024
- Single lane alternating traffic upcoming on Frontage Road, April 2024
- Construction activities starting early April on 97th Avenue Southeast and at Fruitland Landing, March 2024
- Phase 4 detour and trenchless pipe installation coming to Southeast 35th Place as early as April 1, March 2024
- Overnight equipment offloading at East Mercer Way onramp to I-90 Westbound, March 2024
- Join us for a neighborhood conversation on Thursday, March 14 at 4 p.m., March 2024
- Shoreline restoration begins near the Mercer Island Boat Launch, March, 2024
- Crews will be offloading equipment at the East Mercer Way onramp to I-90 Westbound on March 5, February 2024
- Pipe installation and structural upgrades coming to 97th Avenue Southeast and Lift Station 11 at Fruitland Landing, February 2024
- Frontage Road and Mercer Island Boat Launch closed for up to three Fridays and Saturdays as early as February 9, February 2024
- Trenchless pipe installation off 97th Avenue Southeast starts as early as February 12, February 2024
- Phase 1 detour starting on Southeast 35th Place as early as January 16, January 2024
- Southeast 35th Street Neighborhood Conversation Event Summary, December 2023
- Pipe installation scheduled to start Southeast 35th Place mid-December, December 2023
- Pipe installation on Southeast 35th Place mid-December, December 2023
- I-90 trail closing between North Mercer Way and Southeast 35th Place as early as October 23, October 2023
- Tree removal and pipe installation in Northeast Mercer Island to begin as early as October 23, October 2023
- Underwater pipe installation moves toward Mercer Island in October, September 2023
- Underwater pipe installation continues in Lake Washington’s East Channel, August 2023
- Work in Lake Washington’s East Channel will last through early 2024, June 2023
- Utility location around Enatai Beach Park as early as June 5, June 2023
- Construction work on the I-90 trail will begin as early as June 8, June 2023
- Weekend overflow parking for the Mercer Island Boat Launch at City Hall, May 2023
- Work begins at North Mercer Way and Southeast 35th Street as early as May 31, May 2023
- Preparation activities beginning at the Mercer Island Boat Launch, May 2023
- Work begins at North Mercer Way and SE 35th St as early as April 10, March 2023
- Construction on Southeast 35th Place begins November 28th, November 2022
- Please join us on Monday, November 7, for a neighborhood walk on SE 35th Place, October 2022
- Upcoming construction activities: King County to begin in-water work in Lake Washington’s East Channel, October 2022
- Construction equipment and material storage coming to South Parking Lot in Luther Burbank Park, September 2022
- Schedule Update: I-90 trail work begins today with closures starting as early as June 17, June 2022
- Construction work on the I-90 trail will begin as early as June 8, June 2022
- Surveying continues/utility locates beginning in May, May 2022
- Construction equipment and activity coming to Mercer Island Boat Launch, April 2022
- Northeast Mercer Island pre-construction StoryMap - What you need to know as construction gets started, April 2022
- Construction equipment and activity coming to empty lot near E Mercer Way and Frontage Rd, April 2022
Area 7. Enatai Beach Park
Recent update
- Substrate monitoring planned in the East Channel, December 2024
Area 7. past updates
- Final paving activities on 108th Avenue Southeast near Southeast 34th Street planned for September 23 – 25, September 2024
- Paving Activities on 108th Avenue Southeast near Southeast 34th Street through late September, August 2024
- In water work along Enatai shoreline planned to start late July, July 2024
- Electrical work on 108th Avenue Southeast near Enatai Beach Park as early as June 11, June 2024
- Construction continues at Enatai Beach Park, May 2024
- Single lane traffic near Enatai Beach Park as early as April 10, April 2024
- Nighttime work in the East Channel begins as early as November 14, November 2023
- Underwater pipe installation moves toward Mercer Island in October, September 2023
- Construction in the public areas at Enatai Beach Park as early as September 11, September 2023
- Work in the East Channel beginning at 6 a.m. starting Aug. 8, August 7, 2023
- Underwater pipe installation continues in Lake Washington’s East Channel, August 2023
- Work in Lake Washington’s East Channel will last through early 2024, June 2023
- Updated Bike Detour Map available, February 2023
- Enatai Siphon pipe installation is complete! December 19, 2022
- Nightwork for the Enatai Siphon pipe installation begins December 16 at Enatai Beach Park, December 15, 2022
- Enatai siphon pipe installation planned to begin as early as December 15th. This will require work around the clock. December 2, 2022
- Extended work hours in Bellevue in preparation for Enatai siphon pipe installation. December 2022
- Upcoming construction activities: King County to begin in-water work in Lake Washington’s East Channel, October 7, 2022
- Crews continue to prepare for Horizontal Directional Drilling (HDD) at Enatai Beach Park and Sweyolocken Pump Station, September 12, 2022
- Saturday work will ramp up across the project corridor, September 2022
- Construction equipment and activity coming to Enatai Beach Park as early as July 1, June 17, 2022
- Construction equipment and activity coming to the Sweyolocken Boat Launch in June, May 18, 2022
- Surveying continues/utility locates beginning in May, May 4, 2022
- Enatai Beach Park pre-construction StoryMap - What you need to know as construction gets started, April 19, 2022
Area 8. Mercer Slough
Recent update
Area 8. past updates
- The Sweyolocken boat launch and Mercer Slough connector trail is now open for community use!, July 2024
- The Mercer Slough connector trail is expected to reopen Spring 2024 with a temporary closure as early as June for repaving, February 2024
- Enatai Siphon pipe installation is complete! December 19, 2023
- Updated Bike Detour Map available, February 2023
- Enatai siphon pipe installation planned to begin as early as December 15th. This will require work around the clock. December 2, 2022
- Extended work hours in Bellevue in preparation for Enatai siphon pipe installation. December 2022
- Construction on Southeast 35th Place begins November 28th, November 22, 2022
- Construction on Southeast 35th Place beginning next week, October 28, 2022
- Crews continue to prepare for Horizontal Directional Drilling (HDD) at Enatai Beach Park and Sweyolocken Pump Station, September 12, 2022
- Saturday work will ramp up across the project corridor, September 2022
- Construction update: Expect intermittent loud noises and/or vibrations. Hammering to begin near Sweyolocken Boat launch. August 18, 2022
- Mercer Slough Bike Trail will be closed while crews work at Sweyolocken Boat Launch, June 10, 2022
- Construction equipment and activity coming to the Sweyolocken Boat Launch in June, May 18, 2022
- Surveying continues/utility locates beginning in May, May 4, 2022
- Mercer Slough pre-construction StoryMap - What you need to know as construction gets started, April 19, 2022