Project documents

Please see the Public engagement page for a list of community meetings and meeting materials (agendas, presentations, summaries, etc.).

Project updates are posted on the project landing page and area updates page.

Newsletters

• Hard work and big progress in 2023, and more to come in 2024! Spring 2024
• Sewer Construction Has Been Progressing For A Year, Spring 2023
• Sewer construction starts this spring! March 2022
• Major construction set to begin later this year across north Mercer Island and southwest Bellevue, Spring 2021

Frequently asked questions

• North Mercer Island/Enatai Sewer Upgrade Project Frequently Asked Questions, July 2022

Fact sheets

• Construction and restoration on the I-90 Trail
• Enatai Beach Park
• Enatai Siphon: Installing a new pipeline under the Enatai Hillside
• Fruitland Landing and 97th Avenue Southeast
• Mercer Island Boat Launch and work across the East Channel of Lake Washington
• Mercer Slough and the Sweyolocken Boat Launch
• North Mercer Pump Station Upgrade
• Odor Control
• Open cut construction on residential streets
• The Plan for Trees

Graphics

• Construction Reference Guide, April 2021
• Final pipeline route, December 2018
• Recommended alternative, November 2016
• Service area

Environmental documents

• Arborist Report: Mercer Island, issued September 2019
• SEPA-DNS environmental checklist for North Mercer/Enatai Sewer Upgrade Project, issued May 23, 2019
• Transportation Study, September 2018
• SEPA-DNS environmental checklist for North Mercer/Enatai Interceptor Inspection, issued May 15, 2018