Project documents
Find a variety of project documents such as project updates, newsletters, and environmental checklists.
For translated materials in Español (Spanish), 中文 (Chinese, Simplified), 正體字 (Chinese, Traditional), 日本語 (Japanese), 한국어(Korean), and Русский (Russian), please go to our Translations page.
Visit the public engagement page to view materials and information shared at meetings. Project updates are posted on the home page.
Notifications
- 2026 Online Open House Postcard
- 2025 ROW Survey Work Notice
- 2024 Fall Geotechnical Work Notice
- 2024 Summer Geotechnical Work Notice
Project brochure
- Project team identifies path for new wastewater pipe, Winter 2026
- 2025 Sammamish Plateau Diversion Project Brochure, Fall 2025
Newsletters
- The Sammamish Plateau Diversion Project moves into early design, Summer 2026
- King County launches the Sammamish Plateau Diversion Project, Fall 2023
Environmental documents
Documents to be posted as project progresses.
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