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Mahoning Avenue Viaduct


Mahoning Avenue Viaduct

East end view looking NW

Photo taken by Brian McKee in April 2009


BH Photo #136881

Street View 

Brief History 

Written by Sherman Cahal

The Mahoning Avenue Viaduct carries Mahoning Avenue over the Shenango River and railroads in New Castle, Pennsylvania. Built in 1923-24, it replaced the circa 1890 Gardner Avenue Bridge that had been destroyed in a flood in 1913.

Funding was finally secured in 1923 and construction began shortly after. Designed by John Farris and Thomas A. Gilkey, the new 1,195-foot bridge was constructed by the Independent Bridge Company of Pittsburgh with three Pennsylvania through trusses and eight deck plate girder approach spans. The new Mahoning Avenue Viaduct was dedicated on December 18, 1924.

In 1940, the bridge deck over the Shenango River was replaced with a reinforced concrete slab.

On May 15, 1957, part of the bridge deck collapsed on an approach span resulting in its immediate repair. Work began in late 1958 to remove most of the bridge deck and to replace girders that had warped. It was not until fall 1960 that the disputes in funding were resolved. Conn Welding finished the repairs and the bridge reopened on October 7, 1961.

The crossing underwent renovation again in April 1986, reopening on August 30.

A major rehabilitation project by the Pennsylvania Department of Transportation began on the Mahoning Avenue Viaduct in May 16, 2016. The two-year project includes the repainting of the bridge, the replacement of bearings, and substructure and steel repairs, the installation of a LED lighting system and new pedestrian railings.


Through truss bridge over Shenango River on Mahoning Avenue in New Castle
New Castle, Lawrence County, Pennsylvania
Open to traffic
Built 1923-24. Rehabilitated 1940, 1957-61; 1986; 2016-2018.
- Independent Bridge Co.
Pennsylvania through truss
Length of largest span: 307.1 ft.
Total length: 1,194.9 ft.
Deck width: 29.5 ft.
Vertical clearance above deck: 18.2 ft.
Approximate latitude, longitude
+40.98167, -80.35333   (decimal degrees)
40°58'54" N, 80°21'12" W   (degrees°minutes'seconds")
Approximate UTM coordinates
17/554400/4536923 (zone/easting/northing)
Quadrangle map:
New Castle South
Average daily traffic (as of 2017)
Inventory numbers
PA 37 0018 0300 2363 (Pennsylvania Bridge Management System number)
PANBI 22183 (Pennsylvania BRKEY bridge number on the 2011 NBI)
BH 31139 (Bridgehunter.com ID)
Inspection report (as of November 2017)
Overall condition: Poor
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Poor (4 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 4 (out of 100)
View more at BridgeReports.com

Update Log 

  • January 6, 2018: Updated by Christopher Finigan: Added category "Riveted"
  • February 14, 2017: Essay added by Sherman Cahal
  • August 15, 2010: New Street View added by James Baughn
  • April 10, 2009: New photos from Brian McKee