 The trusses are formed out of rolled I-beams that were assembled on site using hydraulic riveting, a technology introduced in the 1920s.The decking consists of pavement laid on concrete over I-beams that are mounted on the truss bottom chords and riveted to their vertical elements.The bridge was built in 1937, and was built using standards and technologies introduced by the state during a bridge-building program introduced after a major flooding event in the state in 1927.