USS Ozark was a single-turreted river monitor built for the United States Navy during the American Civil War. The ship served in the Mississippi River Squadron during the war, and participated in the Red River Campaign shortly after she was commissioned in early 1864. Ozark patrolled the Mississippi River and its tributaries after the end of the campaign for the rest of the war. She was decommissioned after the war and sold in late 1865. The ship's activities or owner are not known after her sale, but Ozark transported Federal troops and New Orleans police attempting to apprehend the white supremacists who killed numerous blacks during the Colfax Massacre in 1873. She ferried witnesses back and forth to their homes on the Red River during the subsequent trials in 1874. Her ultimate fate is unknown. Description The ship was long overall and had a beam of . She had a depth of hold of and a draft of six feet. Ozark had a tonnage of 578 tons burthen. She was powered by a pair of two-cylinder steam engines, each driving two four-bladed, propellers, using steam generated by four boilers. The engines were designed to reach a top speed of . They had a bore of and a stroke of . Ozark could carry about of coal. All of the machinery was built by the Franklin Foundry of St. Louis, Missouri. The ship was fitted with three rudders, and the armored pilothouse was mounted on top of the gun turret. The officers' staterooms were built on deck out of light pine, and a hurricane deck was positioned between the turret and the deckhouse, between the two funnels. The hull was subdivided by three transverse and three longitudinal watertight bulkheads. Ozarks main armament initially consisted of two smoothbore, muzzle-loading Dahlgren guns mounted in a twin-gun turret forward. The 11-inch gun weighed and could fire a shell up to a range of at +5° elevation. By July 1864, her armament had been reinforced by the addition of one Dahlgren gun and three Dahlgrens, all on pivot mounts. One of these guns was mounted at the bow, another at the stern and the two others were abreast the deckhouse, one on each broadside. The 10-inch Dahlgren weighed and could fire a shell up to a range of at +19° elevation. The nine-inch gun weighed and could fire a shell to a range of at