The third ship to be so named by the U.S. Navy, Idaho (SP-545), a motor boat, was built in 1907 by Stearns & McKay, Marblehead, Massachusetts; acquired from her owner, W. W. Vensel of Pittsburgh, Pennsylvania, in June 1917; and commissioned at Cape May, New Jersey, 12 July 1917, Chief Quartermaster W. H. Naylor, USNRF, in command.