The fourth USS Seneca (SP-1240) was a United States Navy barge in commission from 1917 to 1919. Seneca was built as a non-self-propelled commercial schooner barge of the same name in 1884 by Delaware River Iron Ship Building and Engine Works at Chester, Pennsylvania. On 18 October 1917, the U.S. Navy purchased her from the Luckenbach Steamship Company for use during World War I. Assigned the section patrol number SP-1240, she was commissioned in 1917 as USS Seneca (SP-1240).