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.

Visit Software Help if you have trouble viewing or downloading documents.

Newsletters

• 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