Departing Pearl Harbor 9 April she carried replacement troops to Saipan, Marianas Islands, and evacuated casualties from Okinawa before returning to the United States on 10 June 1945.

Departing San Pedro, California, 25 May 1946, she arrived at Bikini Atoll 6 June for Operation Crossroads, designed to test the effectiveness of atomic bombs on warships.

Recommissioned 24 March 1951, Bottineau served with Amphibious Forces, Pacific Fleet, until August when she steamed to Norfolk, Virginia, arriving 4 September.

Bottineau served with the Atlantic Fleet, taking part in amphibious training exercises and other routine peacetime duties, until going out of commission at Philadelphia 31 August 1955.

She was struck from the Naval Vessel Register on 1 July 1961 and returned to the Maritime Administration, who transferred her to the National Defense Reserve Fleet, James River, Fort Eustis, Virginia.