The Thornton Creek Alliance (TCA) is a grassroots, nonprofit organization dedicated to preserving and restoring an ecological balance in the Thornton Creek watershed. The Thornton Creek Alliance publishes the Thornton Creek Currents, a newsletter mailed directly to members’ homes.

Our goal is to benefit the creek by encouraging individuals, schools, groups, businesses and government to work together to address the many issues associated with the creek system, including water quality, stabilization of water flow, flood prevention, reforestation, habitat improvement, stream-bank stabilization, open space acquisition, community involvement, and education. We also promote neighborhood-based monitoring and stewardship of Thornton Creek.