USS Somerset was a wooden-hulled, side-wheel ferryboat built at Brooklyn, N.Y., in 1862, which was purchased by the Navy at Washington, D. C., on 4 March 1862 and was commissioned at the New York Navy Yard on 3 April 1862, Lt. Earl English in command.
After another cruise off the coast of Cuba, Somerset was ordered to cruise off Florida between Cedar Key and Apalachicola Bay. There she began a type of duty which characterized her service during her entire Navy career. In the next few months, she performed blockade duty; made a reconnaissance expedition to Way Key where she engaged Confederate Army troops on 15 May; shelled a Confederate fort near the lighthouse in St. Marks River, before landing a party of sailors who wrecked the battery on 15 June; captured blockade running schooner Curlew off the Cedar Keys the next day; and destroyed salt works at the end of the Fernandia Railroad at Depot Key on 4 and 6 October.
Because of the shoal waters she patrolled, Somerset often sent boat parties to serve the Union cause in areas which she could not reach herself. On 27 December, one of her boats capsized in a squall, and three petty officers and one seaman were drowned during operations in St. George's Sound to seal off the Apalachicola River. Up this strategic stream, which held Somersets attention for much of the next two and one-half years, the Confederates were building screw gunboat CSS Chattahoochee and ironclad CSS Muscogee. These Confederate warships never got into action; but, in May 1864, a party of Confederate sailors from Chattahoochee, commanded by Lt. George W. Gift, attempted to capture Union side wheeler which was blockading the Apalachicola. Launches from Somerset discovered the Confederate expedition, drove them off, and captured their boats and supplies.
Later service
Somerset spent most of the final year of the war guarding lest the Southern warships attempt to break the blockade. From time to time, an expedition to gain intelligence or a foray against Southern salt works would enliven her routine blockade duty. Her last excitement came in the closing weeks of the war when, on 30 March 1865, she joined Sunfewer in destroying salt works on St. Joseph's Bayou.
Decommissioned
After peace returned, the steamer - badly in need of repair and towed by Isnomia - headed for New York. She was sold at public auction there on 12 July 1865 to the Union Ferry Co. Documented on 14 February 1866, the rejuvenated Somerset began a career as a New York ferryboat which lasted until she was retired in 1914.
