The South Carolina portion of the Upper Savannah River Basin (hydrologic unit 03060103) is located in Anderson, Abbeville, Greenwood, McCormick and Edgefield Counties, and encompasses 6 watersheds and 1,165 square miles in the Piedmont geographical region of the state. The upper Savannah River Basin extends into Georgia. There are 1,097,768 acres in the extended watershed; 352,660 acres or 32.1% are outside of South Carolina. The South Carolina portion of the upper Savannah River Basin consists of 55.3% forested land, 27.4% agricultural land, 9.3% urban land, 5.7% water, 1.7% forested wetland (swamp), and 0.6% barren land. There are approximately 3,365 stream miles and 83,241 acres of lake waters in this extended basin.
The Seneca River Watershed and the Tugaloo River Watershed join to form the Savannah River within Lake Hartwell. The Savannah River flows out of the Hartwell Dam and into Lake Russell, where it accepts drainage from the Rocky River (Lake Secession, Wilson Creek). The Savannah River then flows out of the Richard B. Russell Dam and into Lake J. Strom Thurmond, where it accepts drainage from the Little River and Long Cane Creek.
For an overview of water quality in the Lower Savannah River Watershed, download the water quality assessment summary. For specific basin descriptions, facts, figures, and detailed maps click on a watershed below.