The Coosa River is a tributary of the Alabama River in the U.S. states of Alabama and Georgia. The river is about 280 miles (450 km) long.
The Coosa River begins at the confluence of the Oostanaula and Etowah rivers in Rome, Georgia, and ends just northeast of the Alabama state capital, Montgomery, where it joins the Tallapoosa River to form the Alabama River just south of Wetumpka. Around 90% of the Coosa River's length is located in Alabama. Coosa County, Alabama, is located on the Coosa River.
The Coosa is one of Alabama's most developed rivers. Most of the river has been impounded, with Alabama Power, a unit of the Southern Company, maintaining seven dams on the Coosa River. The dams produce hydroelectric power , but are costly to some species endemic to the Coosa River.