USS Napa, an 1175-ton Casco-class light draft monitor built at Wilmington, Delaware, was converted to a spar torpedo vessel while still under construction in 1864. She was delivered to the U.S. Navy in May 1865, but was never placed in commission. While laid up at the League Island Navy Yard, at Philadelphia, Pennsylvania, Napa's name was changed to Nemesis in June 1869, but reverted to Napa less than two months later. She was scrapped in 1875.

This page features the only views we have related to USS Napa.

Photo #: NH 58791 USS Monadnock (1864-1874) and USS Napa (1865-1875) Engraving published in "The Soldier in Our Civil War", Volume II, page 226.
Photo #: NH 55203 "Torpedo Arrangement & Platform ... Light Draft Monitors" Plan of the spar torpedo equipment designed for installation on the U.S. ships Casco, Chimo, Napa, Naubuc and Modoc, circa 1864. The original drawing is in the records of the Bureau of Ships at the U.S. National Archives. Online Image: 136KB; 1200 x 920 pixels