The Three Sisters are three very similar self-anchored suspension bridges spanning the Allegheny River in downtown Pittsburgh, Pennsylvania at 6th, 7th, and 9th streets, generally running north/south.
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- 124.9680
- 131.0640
- 134.7216
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| dbpedia-owl:Building/architectualBureau
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- 1926-06-17 (xsd:date)
- 1926-11-26 (xsd:date)
- 1928-10-19 (xsd:date)
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- 124.9680
- 131.0640
- 134.7216
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- 1926-06-17 (xsd:date)
- 1926-11-26 (xsd:date)
- 1928-10-19 (xsd:date)
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- The Three Sisters are three very similar self-anchored suspension bridges spanning the Allegheny River in downtown Pittsburgh, Pennsylvania at 6th, 7th, and 9th streets, generally running north/south. The bridges have been given formal names to honor important Pittsburgh residents: Roberto Clemente Andy Warhol Rachel Carson Designed by the Allegheny County Department of Public Works, they were all built in a four year period, from 1924 to 1928, by the American Bridge Company, replacing earlier bridges of various designs at the same sites. Their construction was mandated by the War Department, citing navigable river clearance concerns. They are constructed of steel, and use steel eyebars in lieu of cables. The Three Sisters are historically significant because they are the only trio of nearly identical bridges, as well as the first self-anchored suspension spans, built in the United States. They are among the only surviving examples of large eyebar chain suspension bridges in America, and furthermore, unusual for having been erected using cantilever methods. The bridges’ design was viewed as a creative response to the political, commercial, and aesthetic concerns of Pittsburgh in the 1920s. The bridges were designed under the auspices of the Allegheny Department of Public Works, by T. J. Wilkerson, consulting engineer; Vernon R. Covell, chief engineer; A. D. Nutter, design engineer; and Stanley L. Roush, architect. The American Bridge Company built the superstructure; while the Foundation Company built the substructure. All three bridges are owned by Allegheny County.
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- Ninth Street Bridge
- Seventh Street Bridge
- Sixth Street Bridge
- The Three Sisters
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- From north bank of the Allegheny, downtown Pittsburgh in background
- From north bank of the Allegheny, looking SW, downtown Pittsburgh in background, Sixth Street Bridge at right. Shows main plate girder (bearing compressive forces) and sidewalk support
- From south bank of the Allegheny, looking NE, oblique view of roadway and south tower, showing eyebar links for main suspenders and roadway suspenders, as well as main compressive stiffening girders dividing roadway from sidewalks
- View of Sixth, Seventh and Ninth Street Bridges from downriver
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- 2 Vehicular lanes, 2 sidewalks
- Ninth Street
- Seventh Street
- Sixth Street
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- The Three Sisters are three very similar self-anchored suspension bridges spanning the Allegheny River in downtown Pittsburgh, Pennsylvania at 6th, 7th, and 9th streets, generally running north/south.
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- Three Sisters (Pittsburgh)
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- Andy Warhol Bridge
- Ninth Street Bridge
- Rachel Carson Bridge
- Roberto Clemente Bridge
- Seventh Street Bridge
- Sixth Street Bridge
- The Three Sisters
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