Come and join us today! Learn More Your Watershed Over 90% of the creek’s main channel, more than 15 miles, flows above ground through more than 700 backyards and through 15 parks and natural areas. Learn More About TCA Thornton Creek Alliance (TCA) is an all-volunteer grassroots, nonprofit organization dedicated to preserving and restoring an ecological balance. Learn More Join TCA The larger the group, the greater the voice! Member dues help to fund our many projects. You can also volunteer your time & ex
We are a group of dedicated volunteers who are working to preserve and protect our urban watershed. We work on multiple fronts: habitat restoration, issue advocacy, and education and outreach. Your support is welcome and would be gratefully accepted. We’re a 501(c)(3) nonprofit organization; your donation is tax-deductible to the extent allowed by law. Donate Now Become a Community Scientist Learn how to help your community
Members and volunteers monitor pollutants and collect data at a variety of locations along the creek. Using this information, we partner with Seattle Public Utilities to pinpoint pollution sources and improve the water quality for everyone. Join this innovative program to keep Thornton Creek and it residents thriving in their urban setting. Act Now Our recent projects More Projects A Healthy Watershed Needs a Healthy Forest Canopy Active Projects