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Pennsylvania Turnpike Allegheny River Bridge

Pennsylvania Turnpike Allegheny River Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: August 2, 2007

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Key Facts

Facility Carried / Feature Intersected
I-76 (Pennsylvania Turnpike) Over Allegheny River
Location
Near Oakmont: Allegheny County, Pennsylvania: United States
Structure Type
Metal Cantilever Rivet-Connected Warren Deck Truss, Fixed and Approach Spans: Metal Deck Girder, Fixed
Construction Date and Builder / Engineer
1951 By Builder/Contractor: Unknown and Engineer/Design: Modjeski and Masters

Technical Facts

Rehabilitation Date
1987
Main Span Length
534 Feet (162.76 Meters)
Structure Length
2186 Feet (666.29 Meters)
Roadway Width
61 Feet (18.59 Meters)
Spans
5 Main Span(s) and 4 Approach Span(s)
NBI Number
27076990048000

Historic Significance Rating (HSR)

Bridge Documentation

This bridge no longer exists!

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This historic bridge was demolished July 13, 2010 at 10:00 AM EDT.

As a 1951 structure, this bridge is a very early, and very large, example of limited-access highway bridge construction, and was built before the Interstate System came into existence. As such, it is representative of pre-interstate freeway design.

The photos of this bridge were taken from the north bank of the river, and actually show the smaller spans of the main part of the bridge. A larger navigation channel span is obscured by an island present at this location.

This bridge is next to an impressive railroad bridge.

Pennsylvania has decided to do what it has been doing with nearly every old bridge on the Allegheny River it has a say over, which is to demolish the bridge, ignoring any potential for cost, material, and history saving rehabilitation. In 2001, the National Bridge Inventory gave a 63.5% sufficiency rating, which is indicative of a structure for which rehabilitation rather than demolition should be considered. Given the other historic bridges on the Allegheny River that are far older, rarer, historic, and beautiful that Pennsylvania has wiped off the face of the earth, the demolition of this bridge perhaps seems almost insignificant. However, it is one more attractive bridge that has been lost to Pennsylvania's apparent quest to rid the Allegheny River of all bridges with historic value.

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Photo Galleries and Videos: Pennsylvania Turnpike Allegheny River Bridge

 
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