The Sixth Street Bridge is one of three nearly identical bridges that sit by side and are known as the "Three Sisters Bridges." They are unusual bridges due to the fact that instead of having cables, they use eye-bars. This gives them quite a different appearance from the average cable suspension bridge. Stiffening for the bridge is accomplished by through plate girders. They were the first examples of self-anchored suspension bridges, meaning the eyebars tie into the the stiffening girders, but not to any anchorages. The bridge has a 430 Feet (292.6 Meters) span between towers, 960 Feet (11.6 Meters) total suspended length, and 39.7 Feet (12.1 Meters) of navigation vertical clearance. The listed Minimum Vertical Underclearance is 14.3 Feet (4.36 Meters) Over Highway.
The bridge apparently sometimes closes to vehicular traffic during games at PNC Park, allowing pedestrians to walk on the vehicular roadway. This is a great opportunity to photograph the bridge from the roadway without the nuisance of angry drivers honking their horns at you.
Above: Photo showing previous bridge at location. Source: Library of Congress
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