SS Senator was a steel-hulled Great Lakes freighter that sank on Lake Michigan with the loss of nine lives and 268 Nash automobiles, on Halloween of 1929 after she was rammed in heavy fog by the bulk carrier Marquette. She lies in 450 feet (140 m) of water 16 miles northeast of Port Washington, Wisconsin. On April 12, 2016 her wreck was listed on the National Register of Historic Places.