Passaic, first of a ten-ship class of 1335-ton ironclad monitors, was built by Continental Iron Works, Greenpoint, Brooklyn, New York, under subcontract from John Ericsson.[1] The engine was built by Delemater Iron Works and it had a propeller of cast iron, 12 ft (4 m) in diameter.[2] It was launched 30 August 1862; and commissioned 25 November 1862, Captain Percival Drayton in command.
Anchoring off Port Royal, South Carolina, on 21 January, she proceeded to Wassaw Sound. On 23 February with USS Marblehead, Passaic captured schoonerGlide laden with cotton. With her sister monitors, Passaic attacked Fort McAllister to test her fighting capabilities in action. On 7 April, she took part in Rear Admiral Samuel F. Du Pont's attack on Charleston, South Carolina. Severely battered during the engagement, she returned to New York and decommissioned for repairs 12 May.
Recommissioned 19 July, Passaic arrived off Morris Island in Charleston Harbor on 25 July, and took part in all operations against that place. Rear Admiral John A. Dahlgren used her as his flagship during the attack on Fort Moultrie, and she assisted in rescuing USS Lehigh when that monitor ran aground under the fire of Fort Moultrie.
Additional technical data from Gardiner, Robert (1979). Conway's All the World's Fighting Ships 1860–1905. Conway Maritime Press. p. 120. ISBN0-85177-133-5.
Wright, Christopher C. (June 2021). "Canonicus at Jamestown, 1907". Warship International. LVIII (2): 126–162. ISSN0043-0374.