Home > All By Location regional map > Pittsburgh West > Seventh Street Bridge (Andy Warhol Bridge) Search pghbridges.com Search WWW View toward North Side Elevation drawing looking downstream      View toward North Side during construction (Carnegie Library, PA Dept.) Built as cantilever structure (Carnegie Library, PA Dept.) More detail photos OFFICIAL NAME: Andy Warhol Bridge OTHER DESIGNATION: Seventh Street Bridge LOCATION: Pittsburgh USGS 7.5" Topo Quad - UTM Coordinates: Pittsburgh West - Zone 17; 0584 4477 CARRIES: Seventh Street BETWEEN: -- Sandusky St on right descending bank of Allegheny River -- Seventh St and Fort Duquesne Blvd on left descending bank of Allegheny River CROSSES: -- Allegheny River at mile 0.6; Tenth Street Bypass TYPE OF CONSTRUCTION / DESIGN: Self-anchored Suspension cables are steel eyebar chain steel eyebar suspenders steel plate girder deck rusticated ashlar piers LENGTH OF MAIN SPAN: 422 ft clear span TOTAL LENGTH (including longest elevated ramp): 1061 ft HEIGHT OF DECK: 40.1 ft Emsworth Dam normal pool level 710 ft YEAR ERECTED / ENGINEER: 1925-26, County of Allegheny Vernon R. Covell, T.J. Wilkerson, A.D. Nutter, and H.E. Dodge of the Allegheny County Department of Public Works, engineers; Stanley L. Roush, architect Allegheny County, current owner ADDITIONAL INFO: One of the "Three Sisters." Municipal Art Commission mandated suspension as form of the bridges, but site conditions did not allow for typical anchorages. Bridges were built as cantilevers until catenaries were completed. In a very unusual, self-anchored suspension design, instead of heavy anchorages to hold the cable ends, rigid towers hold the ends apart. First of this type in US. Deck girders were previously painted green and remaining superstructure was painted aluminum grey. Most downtown Pittsburgh river bridges are currently painted golden yellow (the official city colors are Black and Gold). Replaced a two-span suspension bridge (1884-1925) which had truss-bracing on catenaries holding two eyebar-chain cables in concentric arcs. This previous bridge was designed by Gustav Lindenthal three years after he built the Smithfield Street Bridge. Seventh St was formerly Irvine St (or Irwin St) in Pittsburgh; it aligns with Sandusky St in the former city of Allegheny (Northside). Field Notes provide additional technical information. view page - "Three Sisters" Bridges -- Historic American Engineering Record document Plaques mounted on the utility houses near the ends of the bridge: Seventh Street Bridge Erected 1925-1926 Allegheny County County Commisioners Joseph G. Armstrong - 1925-26 - Chairman Edward V. Babcock - 1925-26 James Houlahen - 1925--26 Addison C. Gumbert - 1925 County Controller John P. Moore Department of Public Works Director - Norman F. Brown Assistant Director - C. M. Reppert Chief Engineer - V. R. Covell Chief Design Engineer - A. D. Nutter Construction Engineer - A. A. Henderson Consulting Engineer - T. J. Wilkerson Architect - Stanley L. Roush Contractors Substructure - The Foundation Co. Superstructure - American Bridge Co. Paving Contractor - M. O'Herron Co. Electrical - Delmer Electric Co. Utility Houses - W. F. Trimble & Sons Co. Historic Landmark Seventh Street Bridge Department of Public Works, Allegheny County, Engineers 1926 Pittsburgh History & Landmarks Foundation FIELD CHECKED: 09-Jul-1999, 02-Jul-2001 INFO SOURCES: Comm. of PA, et. al.: "Historic Hwy Bridges"; Kidney: "Landmark Architecture"; USACE Allegheny River Nav. Charts Submit info or inquiry - share some facts or ask a question. Introduction -- Nearby Structures Page created: Last modified: 10-Jul-2001 View Larger Map copyright: © Bruce S. Cridlebaugh 1999-2008 All Rights Reserved