Williams Bridge Company, a subsidiary of Williams Industries, specializes in welded plate girders and fracture critical work. The company is a fabricator and erector for bridge superstructures, heavy industrial and commercial work and plate fabrications. It is certified by the American Institute of Steel Construction as a Category III manufacturer capable of producing products and services for use in conventional and complex steel structures and major steel bridges. The company is a participant in the Federal Highway Administration's Curved Steel Bridge Research Project. Williams Bridge Company s plants are located in Manassas and Richmond, Va.