The South Carolina portion of the Tugaloo River/Seneca River Basin (hydrologic units 03060102, 03060101) is located in Oconee, Anderson, and Pickens Counties, and encompasses 12 watersheds and 1,269 square miles that extend across the Blue Ridge and Piedmont regions of the state. The Tugaloo River/Seneca River Basin extends into Georgia and North Carolina. There are 1,170,070 acres in the entire watershed; 357,695 acres or 30.6% are outside of South Carolina. The Tugaloo River/Seneca River Basin within South Carolina consists of 59.4% forested land, 23.3% agricultural land, 9.2% urban land, 7.0% water, 0.6% barren land, and 0.5% forested wetland. There are approximately 3,831 stream miles and 67,532 acres of lake waters in this extended basin.
The Chattooga River flows across the North Carolina/South Carolina state line and flows between the states of South Carolina and Georgia. The Chattooga River then flows through Tugaloo Lake and Lake Yonah, becoming the Tugaloo River. The Tugaloo River accepts drainage from the Chauga River and other smaller streams before joining the Seneca River.
The Whitewater River and the Toxaway River join to form the Keowee River in Lake Jocassee near the North Carolina border. The Keowee River flows out of the Lake Jocassee Dam and into Lake Keowee. The Keowee River flows out of the Keowee Dam and merges with the Little River coming out of the Little River Dam to form the Seneca River and Lake Hartwell. The Seneca River within Lake Hartwell accepts drainage from Twelvemile Creek, Coneross Creek, Eighteenmile Creek and Three and Twenty Creek. The Tugaloo River converges with the Seneca River within Lake Hartwell to form the Savannah River.
For an overview of water quality in the Tugaloo River/Seneca River Watershed, download the water quality assessment summary. For specific basin descriptions, facts, figures, and detailed maps click on a watershed below.