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Rachel Carson Bridge

1926 establishments in PennsylvaniaBridges completed in 1926Bridges in PittsburghBridges over the Allegheny RiverHistoric American Engineering Record in Pennsylvania
National Register of Historic Places in PittsburghPittsburgh History & Landmarks Foundation Historic LandmarksRachel CarsonRoad bridges on the National Register of Historic Places in PennsylvaniaSelf-anchored suspension bridgesSuspension bridges in Pennsylvania
Pittsburgh Ninth Street Bridge
Pittsburgh Ninth Street Bridge

Rachel Carson Bridge, also known as the Ninth Street Bridge, spans the Allegheny River in Downtown Pittsburgh, Pennsylvania in the United States. The total length is 840 feet (260 m) including the 410-foot (120 m) main span and two 215-foot (66 m) side spans, or 995 feet (303 m) including the approaches. The total width of the deck is 62 feet (19 m), including the 38-foot (12 m) roadway plus two 10-foot (3.0 m) sidewalks outside the compressive plate girder. Whereas the roadway formerly carried two vehicle lanes and two streetcar tracks, it was changed to carry four wide vehicle lanes. The 2019-2020 refurbishment reduced the lanes to three. Named for the naturalist and author Rachel Carson, a Pittsburgh native, it is one of three parallel bridges called the Three Sisters, the others being the Roberto Clemente Bridge and the Andy Warhol Bridge. The Three Sisters are self-anchored suspension bridges and are 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.

Excerpt from the Wikipedia article Rachel Carson Bridge (License: CC BY-SA 3.0, Authors, Images).

Rachel Carson Bridge
9th Street, Pittsburgh

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Wikipedia: Rachel Carson BridgeContinue reading on Wikipedia

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Latitude Longitude
N 40.4467 ° E -79.9998 °
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Rachel Carson Bridge

9th Street
15222 Pittsburgh
Pennsylvania, United States
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Pittsburgh Ninth Street Bridge
Pittsburgh Ninth Street Bridge
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Three Sisters (Pittsburgh)
Three Sisters (Pittsburgh)

The Three Sisters are three 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 (Sixth Street Bridge) Andy Warhol (Seventh Street Bridge) Rachel Carson (Ninth Street Bridge)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 their self-anchoring designs. 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 County 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.