The need for LSTs was urgent, and the program enjoyed a high priority throughout the war. Since most shipbuilding activities were located in coastal yards that were mainly used for construction of large, deep-draft ships, new construction facilities for the LSTs were established along inland waterways, some converted from heavy-industry plants, such as steel fabrication yards. Shifting the vessels was complicated by bridges across waterways, many of which were modified by the Navy to permit passage. A dedicated Navy "Ferry Command" orchestrated the transportation of newly constructed ships to coastal ports for final fitting out. Of the 1,051 LSTs built during the war, 670 were supplied by five "cornfield shipyards" in the Middle West. Dravo Corporation's facility at Neville Island, Pennsylvania, designated the lead shipyard for the project, built 145 vessels and developed fabrication techniques that reduced construction time and costs at all of the LST shipyards. The Missouri Valley Bridge & Iron Co. built the most LSTs of any shipyard, with 171 constructed at Evansville, Indiana. Chicago Bridge and Iron's shipyard in Seneca, Illinois, launched 156 ships and was specifically chosen because of their reputation and skills, particularly in welding. The American Bridge Company in Ambridge, Pennsylvania, built 119.