Miantonomoh-class monitor
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USS Miantonomoh in Washington Navy Yard, 1865
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| Class overview | |
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| Name: | Miantonomah class |
| Operators: |
 United States Navy
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| Preceded by: | Canonicus class |
| Succeeded by: | USS Dictator |
| Subclasses: | Agamenticus, Miantonomah, Tonawanda |
| Built: | 1862–1865 |
| In service: | 1864–1872 |
| Completed: | 4 |
| Scrapped: | 4 |
| General characteristics | |
| Type: | Monitor |
| Displacement: | 3,400 long tons (3,455 t) |
| Length: | 258 ft 6 in (78.8 m) |
| Beam: | 52 ft 9 in (16.1 m) |
| Draft: | 12 ft 8 in (3.9 m) |
| Installed power: |
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| Propulsion: |
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| Speed: | 9–10 knots (17–19 km/h; 10–12 mph) |
| Complement: | 150–67 |
| Armament: | 4 × 15 in (380 mm) smoothbore Dahlgren guns (2×2) |
| Armor: |
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The Miantonomoh class were a series of monitors of the U.S. Navy were constructed during the U.S. Civil War, but only one ship of the class took part in it. They were broken up in 1874–75.
Designed by John Lenthall. The hull of the monitors were of a conventional form, but were constructed of wood, not iron. The ships displaced 3,400 long tons (3,500 t) and were 258 feet 6 inches (78.79 m) in length with a 53 feet (16 m) beam and 13 feet (4.0 m) draft. Freeboard was 31 inches, which left part of the hull exposed, this was covered several inches of armor plate backed by oak. The turrets, with 11 inches (280 mm) of a armor, were similar to the turrents on the Passaic-class, only slightly larger. There were pilothouses fitted on the top of each turret. A light hurricane deck was constructed between the turrets, along with a tall funnel and a tall ventilation shaft. There were some variations within the class which leads some sourcesto identify them as four one-ship classes. One difference was that Tonawanda's turrets were closer together than the other three ships in the class.
By the 1870s the wooden hulls had already began to rot, and the ships were taken out of service. As part of Secretary of the Navy George M. Robeson's ambitious plans to overhaul and modernize ships of the Navy, the ships were moved to shipyards in 1874, ostensibly for "repairs". On 23 June 1874 Congress authorized funds for the purpose of "completing the repairs" of four double‑turreted monitors. However, the "repairs" consisted of the constructing of new vessels under the guise of repairing the old ones. They were broken up in 1874–1875 and but few of their materials were used in the building of the larger, more heavily armored, iron‑hulled "New Navy" monitors.
Agamenticus operated off the northeast coast of the United States from Maine to Massachusetts until she was decommissioned at the Boston Navy Yard on 30 September 1865. Renamed Terror on 15 June 1869, the monitor joined the North Atlantic Fleet on 27 May 1870. She primarily operated between Key West, Florida, and Havana, Cuba, over the next two years. Terror, towed by the tug Powhatan, headed north for Philadelphia where she was placed out of commission and laid up on 10 June 1872. During this time, from 1872 to 1874, her deterioration progressively worsened, with dry rot eating away her timbers. She was broken up in 1874.
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