Neosho-class monitor

A drawing of Neosho as she appeared in 1863
Class overview
NameNeosho class
BuildersUnion Iron Works, Carondelet, Missouri
OperatorsUnited States Navy
Built1862–63
In service1863–73
Retired2
General characteristics
TypeRiver monitor
Tons burthen523
Length180 ft (54.9 m)
Beam45 ft (13.7 m)
Draft4 ft 6 in (1.4 m)
Depth of hold9 ft (2.7 m)
Installed power
Propulsion
Speed12 miles per hour (19 km/h)
Complement100 officers and men
Armament2 × 11-inch (280 mm) smoothbore Dahlgren guns
Armor
  • Gun turret: 6 in (152.4 mm)
  • Hull: 2.5 in (64 mm)
  • Deck: 1.25 in (32 mm)

The Neosho-class monitors were a pair of ironclad river monitors laid down in mid-1862 for the United States Navy during the American Civil War. After completion in mid-1863, both ships spent time patrolling the Mississippi River against Confederate raids and ambushes as part of Rear Admiral David Porter's Mississippi Squadron. Both ships participated in the Red River Campaign in March–May 1864, although Osage supported the capture of Fort DeRussy in March and participated in the Battle of Blair's Landing in April. Osage was grounded on a sandbar for six months after the end of the campaign while Neosho resumed her patrols on the Mississippi. The latter ship supported the Union Army's operations on the Cumberland River and provided fire support during the Battle of Nashville in December.

Osage, after being refloated and repaired, was transferred to the West Gulf Blockading Squadron in early 1865 for the campaign against Mobile, Alabama. During the Battle of Spanish Fort in March 1865 she struck a mine and rapidly sank. The ship was later salvaged and sold in 1867. Neosho was decommissioned after the war and remained in reserve until sold in 1873.