The original International Railroad Bridge, which opened in 1887 to link the American and Canadian Saults, has undergone numerous changes. In 1913, when the Davis and Sabin locks were under construction, the two lattice truss spans—each 104 feet long—and one of the ten 239-foot camelback truss spans were removed and replaced with a Straus Trunnion Bascule Bridge, designed by the Straus Bascule Bridge Company of Chicago and built by the Pennsylvania Steel Company. This trunnion bridge, commonly called the “Jackknife Bridge,” is 23 feet in width and 336 feet in length. The swing span was replaced in 1945 by a vertical-lift bridge, 21 feet in width, 369 feet in length, and with steel towers each 175 feet high and equipped with 70-ton counterweights.