The teen's body was found in the Chattooga River on Tuesday morning.
The Georgia Emergency Management Agency also reported a new death in Douglas County west of Atlanta, bringing the toll in that county to four people. No more details were immediately available.
Other victims have included a 2-year-old boy who was swept away from his family when a creek ripped open their west Georgia mobile home Monday.
Aerial shots showed schools, parking lots and even entire neighborhoods submerged by the deluge, sending some unlucky residents scurrying for higher ground.