USS Klamath — a single-turreted, twin-screw monitor of the United States Navy — was launched 20 April 1865 by S. T. Hambleton & Co., Cincinnati, OH, under subcontract with Alexander Swift & Co., also of Cincinnati, OH. She was delivered to the Navy on 6 May 1866 but was never commissioned and saw no service. Klamath was a Casco-class, light-draft monitor intended for service in the shallow bays, rivers, and inlets of the Confederacy. These warships sacrificed armor plate for a shallow draft and were fitted with a ballast compartment designed to lower them in the water during battle.