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Official government websites use .gov

Website addresses ending in .gov belong to official government organizations in the United States.

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Secure .gov websites use HTTPS

A lock lock or https:// means you've safely connected to the .gov website. Only share sensitive information on official, secure websites.

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; project updates are posted on the home page.

Notifications

Newsletters

King County launches the Sammamish Plateau Diversion Project, Fall 2023

Environmental documents

Documents to be posted as project progresses.

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