"Potomac" was sold to Warren G. Toone in April 1960 and used as a private ferry boat between Puerto Rico and the Virgin Islands. In 1962, there was a failed attempt to attend the World's Fair in Seattle due to engine trouble in Long Beach. She was registered in 1963 by Hydro-Capital in Newport Beach, California as a museum ship with call sign WA9710. Records show "Potomac"s home port was Los Angeles from 1963 to 1967.