Pittsburgh in Allegheny County, Pennsylvania — The American Northeast (Mid-Atlantic)
The Three Sisters Bridges
Three Rivers Heritage Trail
Their design is unique. They are self-anchoring suspension bridges-standing firmly on piers in the river and extending stiff girders out to meet the banks-but they are not anchored to the land. Their rigid eyebar chains are suspended from central towers and fastened to the end of giant girders that hold up the roadway.
In 1926 the City Art Commission influenced the design of the first bridge, the Seventh Street Bridge, which was based on a rare example in Cologne, Germany. Pittsburgh's American Bridge Company built the bridge. The design reflected the Art Deco architectural style of the period. Within two years, identical spans were erected at Ninth and Sixth Streets.
In 1928, The American Institute of Steel Construction voted the Sixth Street Bridge, now called the Roberto Clemente Bridge, the "most beautiful bridge" built in America that year. The Three Sisters are listed on the National Register of Historic Places for their significant
Erected by Friends of the Riverfront, Pennsylvania DCNR, Steel Industry Heritage Corporation, City of Pittsburgh, FUZE.
Location. 40° 26.683′ N, 80° 0.075′ W. Marker is in Pittsburgh, Pennsylvania, in Allegheny County. Marker can be reached from the intersection of Fort Duquesne Boulevard and 7th Street. Click for map. Sign is mounted to the railing in Fort Duquesne Boulevard Park. Marker is in this post office area: Pittsburgh PA 15222, United States of America.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Seventh Street Bridge (within shouting distance of this marker); Roberto Clemente Bridge (about 500 feet away, measured in a direct line); The Pittsburgh Agreement (about 600 feet away); Ninth Street Bridge (about 700 feet away); Sisters of Mercy (about 700 feet away); The Benedum Center (about 800 feet away); Heinz Hall (approx. 0.2 miles away); Fort Lafayette (approx. 0.2 miles away). Click for a list of all markers in Pittsburgh.
Categories. • Bridges & Viaducts • Industry & Commerce • Waterways & Vessels •
Credits. This page originally submitted on , by Mike Wintermantel of Pittsburgh, Pennsylvania. This page has been viewed 281 times since then and 5 times this year. Photos: 1, 2, 3, 4, 5, 6. submitted on , by Mike Wintermantel of Pittsburgh, Pennsylvania. This page was last revised on June 16, 2016.