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| History |
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 United States |
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| Name | USS Suncook |
| Ordered | April 1863 |
| Builder | Globe Works, Boston |
| Acquired | 8 July 1865 |
| Commissioned | Never commissioned |
| Fate | Broken up, July 1874 |
| General characteristics |
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| Class and type | Casco-class monitor |
| Displacement | 1,175 long tons (1,194 t) |
| Length | 225 ft (69 m) |
| Beam | 45 ft (14 m) |
| Draft | 9 ft (2.7 m) |
| Propulsion | Screw steamer |
| Speed | 9 knots (10 mph; 17 km/h) |
| Complement | 69 officers and enlisted |
| Armament | 2 × 11 in (280 mm) smoothbore Dahlgren guns |
| Armor |
- Turret: 8 in (200 mm)
- Pilothouse: 10 in (250 mm)
- Hull: 3 in (76 mm)
- Deck: 3 in (76 mm)
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USS Suncook – a single-turreted, twin-screw monitor – was built by the Globe Works, South Boston, and delivered to the government at the Boston Navy Yard on 8 July 1865.
Suncook 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.
Design revisions
Though the original designs for the Casco-class monitors were drawn by John Ericsson, the final revision was created by Chief Engineer Alban C. Stimers following Rear Admiral Samuel F. Du Pont's failed bombardment of Fort Sumter in 1863. By the time that the plans were put before the Monitor Board in New York City, Ericsson and Simers had a poor relationship, and Chief of the Bureau of Construction and Repair John Lenthall had little connection to the board. This resulted in the plans being approved and 20 vessels ordered without serious scrutiny of the new design. $14 million US was allocated for the construction of these vessels. It was discovered that Stimers had failed to compensate for the armor his revisions added to the original plan and this resulted in excessive stress on the wooden hull frames and a freeboard of only 3 inches. Stimers was removed from the control of the project and Ericsson was called in to undo the damage. He was forced to raise the hulls of the monitors under construction by 22 inches to make them seaworthy.
Fate
As a result, the Suncook was laid up at the Philadelphia Navy Yard from 1866 to 1874. Her name was changed to USS Spitfire on 15 June 1869, but she resumed the name Suncook on 10 August 1869. The monitor was broken up at Philadelphia in July 1874.