Decatur was launched on 26 September 1900 by William R. Trigg Company, Richmond, Virginia; sponsored by Miss M. D. Mayo, great-grandniece of Commodore Decatur; and commissioned on 19 May 1902.
Decatur was designated lead vessel of the 1st Torpedo Flotilla with which she conducted drills and maneuvers along the Eastern Seaboard and in the Caribbean until December 1903, when the flotilla departed Norfolk for the Asiatic Station, sailing by way of the Suez Canal.
Arriving at Cavite, Philippines, on 14 April 1904, Decatur exercised along the China coast and cruised in Philippine waters until placed in reserve at Cavite on 5 December 1905. For the next three years, she made infrequent cruises, including one to the southern Philippines in January–February 1908 and Saigon in May 1908.
Decatur ran aground on a sand bar in the Philippines on 7 July 1908 while under the command of Ensign Chester W. Nimitz. The ship was pulled free the next day, and Nimitz was court-martialed, found guilty of neglect of duty, and issued a letter of reprimand.[1]
Placed out of commission on 18 February 1909, Decatur was placed in commission in reserve on 22 April 1910 and in full commission on 22 December. She resumed operations with the Torpedo Flotilla, cruising in the southern Philippines and between ports of China and Japan until on 1 August 1917, when she departed for the Mediterranean.
Assigned to US Patrol Squadrons, Decatur arrived at Gibraltar on 20 October for patrol and convoy duty in both the Atlantic and Mediterranean until on 8 December 1918. Decatur arrived at Philadelphia on 6 February 1919 and was decommissioned there on 20 June. She was sold to Henry A. Hitner's Sons Company on 3 January 1920.