From Dictionary of American Naval Fighting Ships,
Vol. V (1979), pp. 364
A river in Wyoming and Montana.
(LSM(R)-519: dp. 1,084; l. 206'3", b. 34'6", dr. 7'2" (mean); s. 13 k.; cpl. 138; a. 1 5", 4 40mm., 4 20mm.; cl. LSM(R)-501)
LSM(R)-519, originally projected as LSM-519, was laid down 28 April 1945 by the Brown Shipbuilding Co., Inc. Houston, Tex.; launched 2 June 1945, and commissioned 28 July 1945, Lt. John W. Mitchell in command.
Following preliminary shakedown off Galveston, LSM(R)-519, a landing ship medium designed to carry rockets, steamed to Charleston, thence to Little Creek, Va., for completion of training. On 23 October she departed Little Creek for Troy, N.Y., where she conducted Navy Day activities. By 1 November she was back in the tidewater area and on the 5th she sailed south. She arrived at the St. John's River (Fla.) Reserve Berthing Area 9 November and in March 1946 was decommissioned. Named Powder River 1 October 1955, the LSM(R) remained in the Florida Group, Atlantic Reserve Fleet until struck from the Navy List 1 October 1958.