![]() The superstructures, and the Foundation Company built the substructures. The Sister Bridges were designed under the auspices of the Department of Public Works, architect Stanley L. To fund the required bridge work, AlleghenyĬounty voters approved a $29.2 million bond issue in 1924 and construction of the Sister Bridges soon followed. World War I delayed those deadlines, but in 1919, new ones were set. ![]() Including the Sixth, Seventh, and Ninth Street Bridges, were out of compliance, and in 1917, he imposed deadlines for that to be rectified. Baker determined that several local bridges, Ruling in 1904 that they posed no unreasonable problem for shipping.īecause Pittsburgh was the nation’s largest steel producer and steel was a precious commodity, the issue of bridge clearances on area rivers became an issue yet again in 1915. Sibert reported that Pittsburgh bridges were not in compliance, but Secretary of War Elihu Root thought differently, Obstruction” to the free navigation of waters because of insufficient height or span width. It required the Secretary of War to declare bridges over navigable waters to be in violation of the act if they posed “an unreasonable The Sister Bridges were built largely as a result of the Rivers and Harbors Appropriation Act of 1899 passed by Congress. ![]() The county has been rehabilitating the bridges since 2016, and that work is expected to be finished in 2023. Owned by Allegheny County and located over the Allegheny River in the City of Pittsburgh, the bridgesĬonnect downtown and the North Shore. Allegheny County boasts 1,500 bridges that are more than 8 feet long, and possibly the most famous of those structures are the three golden Sister Bridges. ![]()
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