 Following the war, it became known as the Jeffersonville Boat and Machine Company and later changed its name to Jeffboat, the more commonly used short form of its name.The company was the largest inland shipbuilder in the United States and the second-largest builder of barges before it closed in 2018.Jeffboat was originally established as the Howard Shipyards in 1834 by James Howard when he started his first boat, the Hyperion.