While the substructures were under construction, the administration in charge at that time wanted to change the appearance of the truss, reduce the truss depth and eliminate some of the truss bracing to give a more open appearance to the bridge from what was originally proposed. The project was broken into an initial substructure contract and a superstructure contract that followed later, to help spread out the cost. Mahan Construction also worked with Haydon and Kay and Kay as a subcontractor and performed the steel erection for the truss. A joint venture comprised of URS and Stantec designed the superstructure, which was constructed by a joint venture of Haydon Bridge Co.
Highway 60 across the Tennessee River near Paducah. 60 Bridge/New Ledbetter Bridge, 274 meter main span, Kentucky, USA, 2013.Ī Warren truss, the bridge carries four lanes of U.S. Also known as the Outer Harbor Bridge, the bridge is believed to pass within 100 meters of the site at which Francis Scott Key witnessed, in 1814, the bombardment of Fort McHenry, a battle during the War of 1812 that inspired him to write the words of "The Star-Spangled Banner," the U.S. Owned and operated by the Maryland Transportation Authority, the bridge cost $110 million to build. The floating derrick was designed by the project’s steel erector, the John F. Standing 425 ft high, the barge-borne, 200-ton-capacity derrick was used to help erect approach spans and the 722-ft-long anchor arms. It was erected by a 100-ton traveling guy derrick and what may have been, at that time, the world’s tallest stiff-leg derrick. Superstructure contractor Pittsburgh-Des Moines Steel Corp. The central truss spans were designed by Singstad, Kehart, November & Hurka. Francis Scott Key Bridge, 366-meter main span, Maryland, United States, 1977.Ī steel arch-shaped, continuous through-truss bridge totaling 8,636 ft, it carries four lanes of Interstate 695 across the Patapsco River in Baltimore.
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