USS Potomac, Presidential yacht museum in Jack London Square, United States

The USS Potomac is a 165-foot (50 m) steel-hulled ship preserved at Jack London Square in Oakland, California. Its white hull has a row of circular portholes, a raised bridge with rectangular windows, a red life ring, a tall mast flying a blue and white flag, and two white smokestacks with black tops. The aft smokestack is false and once housed a pulley elevator for President Roosevelt.

Franklin D. Roosevelt used this vessel as a floating residence and workspace from 1936 to 1945, holding confidential meetings during the Second World War. After his tenure the craft changed ownership several times and underwent restoration in the 1980s before opening to the public.

The name comes from the Potomac River, but the ship began service as the Coast Guard cutter Electra and was renamed when converted in 1936. Roosevelt used it for fishing, poker games and work on his stamp collection, and in 1939 King George VI and Queen Elizabeth came aboard for the cruise to Mount Vernon. The Potomac Association, chaired by FDR's grandson Michael Roosevelt, runs the museum and spring and summer bay cruises.

The vessel offers onboard guided tours and bay cruises departing from the Oakland dock with space for roughly 120 guests. Visitors should wear sturdy footwear as they navigate stairs and narrow passageways, and bring warm layers for harbor excursions.

A converted smokestack conceals an elevator installed specifically for the president, who used a wheelchair. This design helped hide his limited mobility from public view while allowing him to reach all decks.