Public involvement
North Mercer Island/Enatai sewer upgrade
Construction is starting across north Mercer Island and southwest Bellevue. This project has been years in the making and will involve four years of construction. Project work will be in heavily used public spaces and residential areas. Click on the storymap below to learn about:
- What we are building
- What to expect
- Schedule and duration
- Detour routes
- What it will look like when we’re done
- How to reach us
View meeting calendar.
How King County works with the community
King County works with the community to provide project information and identify potential impacts. Stay informed, stay involved as we share information through:
- Individual meetings and briefings with interested community members and groups
- Virtual meetings and open houses
- Project newsletters and fliers
- Flier boxes with updated information throughout the construction area
- Project Web page
- Email and text alerts
Contact us
Contact the community services leads at:
Emily Berry, 206-848-0698
Annie Pfeifer, 206-263-3203
NMEsewer@kingcounty.gov
24-hour construction hotline:
425-305-3578
Sign up for email or text updates
To sign up for email or text updates, please visit the project home page.
Calendar
Mercer Island Farmers Market Summer Tabling Events
Dates: Sunday, June 19, July 17, August 21
View summary of events .
Online open house, September 2021 - February 2022
Online open house
February 20 - April 15, 2020
The following information was available for review in English, Spanish, Simplified Chinese and Traditional Chinese:
- An interactive project area map
- Brief outline of project progress to date
- Project overview and schedule
- Construction information for:
- Upgraded North Mercer Pump Station
- Residential streets
- North Mercer Way and Island Crest Way
- I-90 Trail
- Fruitland Landing
- Enatai Beach Park
- Construction methods, including in-water work and Horizontal Directional Drilling
- An opportunity to provide optional feedback
https://publicinput.com/nmesewerupgrade
Materials
- Online open house (archived version)
- Online open house summary (February 20 – April 15, 2020)
King County will host open houses on January 29 and 30 to share the latest information about the North Mercer Island/Enatai Sewer Upgrade Project:
Wednesday, January 29
6:30 - 8 p.m.
Mercer Slough Environmental Education Center
1625 118th Avenue S.E., Bellevue, WA
Thursday, January 30
6:30 - 8 p.m.
Mercer Island Community Center
8236 S.E. 24th Street, Mercer Island, WA
There will be no formal presentation. Stop by anytime during the open house to learn about:
- The current status of the project and what we’re building
- What to expect before and during construction
- Restoration plans
Meeting materials
- Postcard
- Event Summary
- What does the Wastewater Treatment Division do?
- Project Timeline
- Sewer Route Overview
- North Mercer Pump Station Construction
- North Mercer Pump Station - Post Construction
- Open Cut Construction on Residential Streets
- Construction on North Mercer Way and Island Crest Way
- I-90 Trail Across Mercer Island to See Major Construction
- I-90 Trail After Construction - Mercer Island
- Sewer work coming to Fruitland Landing and 97th Avenue Southeast
- Mercer Island Boat Launch and Work across the East Channel of Lake Washington – What’s happening?
- What to expect during construction at the Boat Launch and East Channel Crossing
- Installing the Siphon across the East Channel of Lake Washington
- Construction at Enatai Beach Park in Bellevue – what’s happening?
- What to expect after construction at Enatai Beach Park in Bellevue
- Installing a New Pipe Under the Enatai Hillside
- Fixing the Existing Enatai Interceptor
Mercer Island Condo Board briefing
September 24, 2019
Mercer Isle Condos,
2500 81st Ave SE, Mercer Island, WA 98040
6:30 p.m.
Date: Saturday, August 24, 2019
Location: Enatai Beach Park at 3519 108th Avenue S.E.
We’ll be located near the REI Boathouse under the “Go with the Flow” banner logo on our tent. Members from our community relations team will be sharing project updates and answering questions about the North Mercer/Enatai sewer upgrade project. See you there!
Materials
Date: Sunday, August 11, 2019
Location: north end of Mercerdale Park
Join us at the Mercer Island Farmers Market on August 11! The market will be located at the north end of Mercerdale Park on Mercer Island. Look for us under the “Go with the Flow” banner logo on our booth. Project staff will share project updates, answer questions and get you signed up for our mailing list. Hope to see you there!
Materials
Date: Sunday, June 23, 2019
Location: north end of Mercerdale Park
Join us at the Mercer Island Farmers Market on June 23! The market will be located at the north end of Mercerdale Park on Mercer Island. Look for us under the “Go with the Flow” banner logo on our booth. Project staff will share project updates, answer questions and get you signed up for our mailing list. Hope to see you there!
Materials
Date: Friday, May 17, 2019
Time: 6-9 a.m.
Location: I-90 Trail entrance at S.E. 34th Street
Bike Everywhere Day tabling event
King County will host a station for Bike Everywhere Day to share the latest on the North Mercer Enatai Sewer Upgrade Project. Project staff will be available to share information and answer questions about the project.
Materials
October 17, 2018
North Mercer Pump Station Neighbors Meeting
Materials
Tuesday, June 12, 5:30 – 7:30 p.m.
King County’s project team will be walking the streets of the project alignment to discuss the detailed route with neighbors and answer questions about what to expect during construction.
- 5:30 – 6:30 p.m.
- Meeting location: Fruitland Landing Park
- 6:30 – 7:30 p.m.
- Meeting location: West end of SE 35th PL
Materials
Date: Friday, May 18, 2018
Time: 6-9 a.m.
Location: I-90 Trail entrance at S.E. 34th Street
Bike Everywhere Day tabling event
King County will host a station for Bike Everywhere Day to share the latest on the North Mercer Enatai Sewer Upgrade Project. Project staff will be available to share information and answer questions about the project.
Materials
Online open house
March 1 – April 2, 2018
The online open house reviewed:
- Detailed maps of the sewer upgrade route
- What we know now about construction
- Next steps for project design
- How we will work with you throughout the project
A comment form was available to ask questions and share feedback on how King County can be a good neighbor.
Materials
- Postcard
- Flier
- Online open house (archived version)
- Online open house summary (March 1 – April 2, 2018)
Saturday, March 3, 2018
10 a.m. to 1:30 p.m.
King County’s project team will be walking the streets of the project alignment to discuss the detailed route with neighbors and answer questions about what to expect during construction.
- Walk-and-Talk 1: North Mercer Pump Station to S.E. 22nd Way
- 10 a.m. – 11 a.m.
- Meeting location: North Mercer Pump Station, 7631 S.E. 22nd Way
- Walk-and-Talk 2: 78th Ave SE
- 11 a.m. – 12 p.m.
- Meeting location: Intersection of 78th Ave SE and S.E. 22nd Way
- Walk-and-Talk 3: 24th Street and 81st Ave SE
- 12:30 p.m. – 1:30 p.m.
- Meeting location: Intersection of 78th Ave SE and 24th Street
- Walk-and-Talk 4: 90th Pl SE
- 2 p.m. – 3 p.m.
- Meeting location: 90th Place SE cul de sac
Materials
Thursday, Nov. 9, 2017
6- 8 p.m.
Mercer Slough Education Center, 1625 118th Ave SE, Bellevue 98005
Neighborhood Meeting for Southeast Lake Road
Please join King County Wastewater Treatment Division (WTD) on Nov. 9 to discuss the North Mercer/Enatai Sewer upgrade project and learn more about potential construction impacts to the Southeast Lake Road neighborhood. The meeting is intended to provide details on the Bellevue portion of the alignment. This includes pipe rehabilitation in the water from Enatai Beach Park to the Sweyolocken Pump Station.
Materials
- Invitation, 中文
- Agenda
- Summary
- Presentation (video of presentation below)
- Grinder pump fact sheet: Keeping sewage flowing during construction, November 2017
Thursday, Aug. 24, 2017
3-7 p.m.,
Enatai Beach Park
3519 108th Ave. S.E., Bellevue
Information Session
Join us for an information session at Enatai Beach Park! Stop by Enatai Beach Park on Thursday, August 24th anytime between 3 and 7 p.m. to learn more about the North Mercer Island and Enatai Sewer Upgrade Project. King County Wastewater Treatment Division representatives will be there to talk with you about the sewer route, potential construction methods and schedule. A section of the new sewer pipe will run through the park.
Monday, April 24, 2017
6- 8 p.m.,
presentation at 6:30 p.m.
Bellevue High School Library
10416 SE Wolverine Way, Bellevue, 98004
Technical Information Session: Bellevue alignment
Please join King County Wastewater Treatment Division for a discussion on the technical elements of the North Mercer Island and Enatai Sewer Upgrade Project. The meeting is intended to provide details on the Bellevue portion of the alignment. This includes horizontal directional drilling (HDD) under the Enatai hillside and pipe rehabilitation along the water from Enatai Beach Park to the Sweyolocken Pump Station.
Materials
Wednesday, January 25, 2017
6 – 8 p.m.
Mercer Slough Environmental Education Center
1625 118th Ave SE, Bellevue
Thursday, January 26, 2017
6 – 8 p.m.
Mercer Island Community and Event Center
8236 SE 24th St, Mercer Island
Join us for an upcoming community meeting!
King County has finalized the route for an upgraded sewer pipeline in North Mercer Island and Southwest Bellevue. We hope you’ll join us at an upcoming community meeting to discuss:
- The pipeline route and how your feedback informed it
- Potential construction methods
- Pump station upgrades
- Upcoming design milestones and environmental review
- Opportunities for input into the project’s design
Materials
- Post card
- Agenda
- Presentation
- Newsletter, January 2017
- Enatai Neighborhood Community Meeting Summary, January 25, 2017
- North Mercer Community Meeting Summary, January 26, 2017
- Online Open House (available January 25 - February 22)
Sunday, August 21, 2016
10:00 a.m. - 2:00 p.m.
Enatai Beach Park
King County’s North Mercer Island/Enatai Sewer project team will be on hand to talk about the services we provide and elements of the project in Enatai Beach Park, along the water front, and by Sweyolocken Pump Station. You can walk the project area at Enatai with our team and talk about construction activities and restoration. We’ll have some fun activities for kids (and their parents) to learn about how to treat the sewer system well.
Materials
Tuesday, May 10, 2016
Holly Tree Lane Homeowners Association
Private residence
King County project team met with interested members of the Holly Tree Homeowners Association to provide an overview of the project, answer questions, and begin a dialog with residents who may not have attended recent community meetings.
Materials
Wednesday, March 2, 2016,
6:00 - 8:30 p.m.
Presentation at 6:30 p.m.
Mercer Slough Environmental Education Ctr.
1625 118th Ave SE , Bellevue, WA 98005
Thursday, March 10, 2016,
6:00 - 8:30 p.m.
Presentation at 6:30 p.m.
Mercer Island Community Center, Mercer Rm.
8236 SE 24th St, Mercer Island, WA 98040
Community meetings. Learn about the recommended alternative, upcoming field work to inform design, and project elements that are still being defined.
Bring your questions and thoughts to share with us!
Materials
- Postcard
- Bellevue-Enatai neighborhood community meeting
- Mercer Island neighborhood community meeting
- Recommended alternative
- Early design timeline
- Survey
Tuesday, Sept. 15, 2015
6:00 - 8:30 p.m.
Mercer Island Community and Event Center
8236 SE 24th St Mercer Island
Wednesday, Sept.16, 2015
6:00 - 8:30 p.m.
South Bellevue Community Center
14509 SE Newport Way Bellevue
Open house
Learn about the project options, get your questions answered, and share your thoughts.
Materials
July 11 - 12, 2015
Mercer Island Summer Celebration
Public outreach and wastewater education. King County's WTD's sewer inspection truck served as a travelling wastewater education center. Festival goers took a virtual tour of our pipes, learned about the service King County provides your area, and picked up some compost and green cleaning tips.
Materials