During the 1940s, John H. Threadgill, the head of the Steamship Trade Association, initiated a study for a cross-harbor bridge. A bridge across the Inner Harbor of Baltimore was one idea that was discussed frequently. In his capacity as head of the association, Threadgill ultimately recommended that the idea for a cross-harbor bridge be abandoned, due to the fact that Baltimore relied heavily on a shipping trade and fears that the bridge would negatively impede the flow of shipping traffic at the Port of Baltimore. Threadgill was named head of Baltimore's Port Commission during the 1950s.