Coosa (kōˈsə) [key], river, 286 mi (460 km) long, rising in NW Ga. and flowing SW through E Ala., joining the Tallapoosa near Montgomery, Ala., to form the Alabama River. Locks and dams make the river navigable for barges to Rome, Ga. Jordan, Lay, and Mitchell dams on the river generate electricity.
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