104 (also known as Barge 104, or No.104) was an American whaleback barge in service between 1890 and 1898. The fourth whaleback constructed, she was built between October 1889 and February 1890, in Duluth, Minnesota by Alexander McDougall's American Steel Barge Company, for McDougall's fleet of the same name, based in Buffalo, New York. She was a whaleback, a class of distinctive, experimental ship designed and built by McDougall. The whalebacks were designed to be more stable in high seas. They had rounded decks, and lacked the normal straight sides seen on traditional lake freighters. 104 entered service on April 21, hauling iron ore from Two Harbors, Minnesota.