&sq=&lang=&file=File:Monitor_%22Mahopac%22_on_the_Appomattox_River,_1864.jpg) Mahopac at anchor on the Appomattox River, 1864
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| History | |
|---|---|
 United States | |
| Name | USS Mahopac |
| Namesake | Lake Mahopac, New York |
| Ordered | 15 September 1862 |
| Builder | Secor & Co., Jersey City, New Jersey |
| Cost | $701,624 |
| Laid down | 1862 |
| Launched | 17 May 1864 |
| Commissioned | 22 September 1864 |
| Decommissioned | June 1865 |
| Recommissioned | 15 January 1866 |
| Renamed | Castor, 15 June 1869 |
| Renamed | Mahopac, 10 August 1869 |
| Decommissioned | 11 March 1872 |
| Recommissioned | 21 November 1873 |
| Out of service | In ordinary 1889–1895 |
| Stricken | 14 January 1902 |
| Fate | Sold, 25 March 1902 |
| General characteristics | |
| Class and type | Canonicus-class monitor |
| Displacement | 2,100 long tons (2,100 t) |
| Tons burthen | 1,034 tons (bm) |
| Length | 225 ft (68.6 m) |
| Beam | 43 ft 3 in (13.2 m) |
| Draft | 13 ft 6 in (4.1 m) |
| Installed power |
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| Propulsion | |
| Speed | 8 knots (15 km/h; 9.2 mph) |
| Complement | 100 officers and enlisted men |
| Armament | 2 × 15-inch (381 mm) smoothbore Dahlgren guns |
| Armor |
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USS Mahopac (1864) was a Canonicus-class monitor built for the Union Navy during the American Civil War. The vessel was assigned to the James River Flotilla of the North Atlantic Blockading Squadron upon completion in September 1864. The ship spent most of her time stationed up the James River where she could support operations against Richmond and defend against sorties by the Confederate ironclads of the James River Squadron. She engaged Confederate artillery batteries during the year and later participated in both the first and second battles of Fort Fisher, defending the approaches to Wilmington, North Carolina, in December 1864 – January 1865. Mahopac returned to the James River after the capture of Fort Fisher and remained there until Richmond, Virginia was occupied in early April.
A few days later, the monitor was transferred to Washington, D. C. and decommissioned in June and recommissioned in early 1866 for service on the East Coast and in the Caribbean. Mahopac generally remained active until 1889 when she was permanently placed in reserve. She was sold for scrap in 1902.