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), go to our Translations page.
Please also visit the public engagement page to view materials and information shared at meetings.
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Project updates
King County’s Sammamish Plateau Project looks forward to a busy year, February 2024
Welcome to the Sammamish Plateau Diversion Project, December 2023
Newsletters
King County launches the Sammamish Plateau Diversion Project, Fall 2023
Environmental documents
Documents to be posted as project progresses.