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Coal Creek sewer upgrade

The Coal Creek Sewer Upgrade Project will install new sewer pipes to carry more wastewater and meet the growing needs of Bellevue and Newcastle.

Project description

The Coal Creek Sewer Upgrade Project will upgrade a regional sewer line that serves Bellevue and Newcastle. Built between 1966 and 1991, the existing pipeline is nearing its maximum capacity and needs to be upgraded to carry more wastewater and meet the growing needs of the community.

Once installed, the new sewer pipe will serve the area for another 50 years or more.

Project update

June 2025

Red Cedar Trailhead closure beginning as early as June 16

Trailhead Closure and Detour: The Red Cedar Trailhead will close for approximately three years starting as early as Monday, June 16. Other trailheads in the area such as the Cinder Mine, Red Town, Newcastle YMCA, and Forest Drive trailheads are available for trail users.

Interested in a project briefing for your community group?

We are available meet with you or come to your next community event. The project team share the latest project information and talk about what will happen over the next several years of construction. Please contact Frances Kuo 206-492-6499 or CoalCreekProject@kingcounty.gov.

Sign up for the project email list to get updates, learn about construction, and find outreach activities that you can participate in!

Previous project updates

Project location

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