USS Merrimack (often spelled without the "k") was a frigate, best known as the hull upon which the ironclad warship CSS Virginia was constructed during the American Civil War. The CSS Virginia then took part in the Battle of Hampton Roads (also known as "the Battle of the Monitor and the Merrimack") in the first engagement between ironclad warships.
The Merrimack was the first of six screw frigates (frigates with steam power) begun in 1854. Like others of her class (Wabash, Roanoke, Niagara, Minnesota and Colorado), she was named after the eponymous river. In Massachusetts, the Merrimack River flows through the town of Merrimac, often considered an older spelling which has sometimes caused confusion of the name.
Merrimack was launched by the Boston Navy Yard 15 June 1855; sponsored by Miss Mary E. Simmons; and commissioned 20 February 1856, Captain Garrett J. Pendergrast in command. She was the second ship of the Navy to be named for the Merrimack River.
Shakedown took the new screw frigate to the Caribbean and to Western Europe. Merrimack visited Southampton, Brest, Lisbon, and Toulon before returning to Boston and decommissioning 22 April 1857 for repairs. Recommissioning 1 September 1857, Merrimack got underway from Boston Harbor 17 October as flagship for the Pacific Squadron. She rounded Cape Horn and cruised the Pacific coast of South and Central America until heading for home 14 November 1859. Upon returning to Norfolk, she decommissioned 16 February 1860.
USS Merrimack, or variant spelling USS Merrimac, may be any one of several ships commissioned in the United States Navy and named after the Merrimack River.
USS Merrimack (AO-179) was the third ship of the Cimarron-class of fleet oilers of the United States Navy. Merrimack was built at the Avondale Shipyards in New Orleans, Louisiana starting in 1978 and was commissioned in 1981 for service in the Atlantic Fleet. Total cost for the ship was $107.1 million. She was last homeported at Norfolk, Virginia. Between 1989 and 1991 Merrimack was "jumboized", meaning that, after cutting the ship into two sections after about a third from the bow, a 35.7 m long section was added to increase the fuel load. Merrimack was decommissioned on 18 December 1998 and struck from the Naval Vessel Register on the same day. Her title was transferred to the Maritime Administration. Currently being scrapped at Amelia, Louisiana.
The third USS Merrimack (AO-37) (ex-Caddo) was one of five Kennebec-class fleet oilers (also known as a type T2 tanker) built during World War II for service in the United States Navy. She also service in the Cold War. She was named after the Merrimack River in Massachusetts and New Hampshire.
Merrimack was laid down as SS Caddo under Maritime Commission contract on 12 September 1940 by Bethlehem Steel Company, Sparrows Point, Maryland. She was launched on 1 July 1941 and acquired by the U.S. Navy from Socony-Vacuum Oil Company (later Mobil Oil) on 31 December 1941. She was renamed Merrimack on 9 January 1942, and commissioned 4 February 1942, Captain William E. Hilbert in command.
Assigned to the Atlantic Fleet, the new fleet oiler spent the next two-and-a-half years steaming the Atlantic seaways carrying oil for Allied ships from Argentia, Newfoundland to Montevideo, Uruguay, and from ports along the United States East Coast to staging areas in the British Isles and the Mediterranean. Her primary duty was fueling the escorts which protected Allied convoys from German U-boats.