Long Island was built in 1912 by Cobb & Butler in Rockland, Maine and purchased by the US Navy 18 April 1917 from her owner, George B. Morrill.

Assigned to the 1st Naval District, Long Island throughout the war served out of Boston as harbor patrol ship, minesweeper, and icebreaker.

Long Island departed Boston 30 January 1919 for Charleston, S.C., where she arrived 5 February.

Detached from the 6th Naval District 24 June, during the next 2 months she operated along the Atlantic coast from Hampton Roads to Boston.

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