On 4 May, she captured screw steamer Circassian flying British colors between Havana and Matanzas about 10 miles off the Cuban coast.

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.

Somerset spent most of the final year of the war guarding lest the Southern warships attempt to break the blockade.

Her last excitement came in the closing weeks of the war when, on 30 March 1865, she joined Sunflower in destroying salt works on St. Joseph's Bayou.

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.