The Gills Creek Watershed is South Carolina's largest impaired urban watershed, and contains over 70 miles of streams and lakes, and 47,000 acres of land. The watershed is included in the cities of Columbia, Cayce, Forest Acres, and Arcadia Lakes; Richland County, and the US Army's Fort Jackson.

The watershed's headwaters start above Sesquicentennial State Park and flow into the Congaree River just above the Congaree Swamp National Park.

The Gills Creek Watershed Association is dedicated to restoring the watershed through education, grass roots action, public and private partnerships, remediation projects, and controlled development.

The goal is to return the Gills Creek Watershed to a living resource providing recreational opportunities, habitat for native wildlife and plants, and a national model for watershed planning and management.