The Seneca River is created by the confluence of the

Keowee River The Keowee River is created by the confluence of the Toxaway River and the Whitewater River in northern Oconee County, South Carolina. The confluence is today submerged beneath the waters of Lake Jocassee, a reservoir created by Lake Jocassee ...

and Twelvemile Creek in northwestern

South Carolina )''Animis opibusque parati'' ( for, , Latin, Prepared in mind and resources, links=no) , anthem = " Carolina";" South Carolina On My Mind" , Former = Province of South Carolina , seat = Columbia , LargestCity = Charleston , LargestMetro = ...

, downriver from Lake Keowee near Clemson. It is now entirely inundated by

Lake Hartwell Lake Hartwell is a man-made reservoir bordering Georgia and South Carolina and encompassing parts of the Savannah, Tugaloo, and Seneca rivers. Lake Hartwell is one of the Southeastern United States' largest recreation lakes. The lake was created ...

, and forms a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data
The National Map
accessed April 26, 2011 arm of the lake. The Seneca River and the

Tugaloo River The Tugaloo River (originally Tugalo River) is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed April 26, 2011 river that forms the border between the U.S. states of Georgia and South C ...

join to form the

Savannah River The Savannah River is a major river in the southeastern United States, forming most of the border between the states of South Carolina and Georgia. Two tributaries of the Savannah, the Tugaloo River and the Chattooga River, form the nor ...

. The boundary between the Seneca River and the

has changed over time. In the Revolutionary War period, the upper part of the Seneca River was often called the Keowee River. In current times, the section of the Keowee River between the Keowee Dam and its confluence with Twelvemile Creek is called the Seneca River on many maps, including the official county highway map. Since this area was flooded by

, created by damming the Seneca and

Tugaloo Tugaloo (''Dugiluyi'' (ᏚᎩᎷᏱ)) was a Cherokee town located on the Tugaloo River, at the mouth of Toccoa Creek. It was south of Toccoa and Travelers Rest State Historic Site in present-day Stephens County, Georgia. Cultures of ancient ind ...

rivers, this section is often referred to as the Seneca.

References

Rivers of Oconee County, South Carolina Rivers of South Carolina Cherokee tribe Rivers of Pickens County, South Carolina Rivers of Anderson County, South Carolina Tributaries of the Savannah River {{SouthCarolina-river-stub