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photo of bridge

View toward North Side

photo of bridge

Elevation drawing looking downstream

photo of bridge  photo of bridge  

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


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Introduction -- Nearby Structures


Page created:
Last modified: 10-Jul-2001

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