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Lebanon Road Bridge

Lebanon Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 4, 2013

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Key Facts

Facility Carried / Feature Intersected
Lebanon Road (PA-885) Over Railroad (Union Railroad)
West Mifflin: Allegheny County, Pennsylvania: United States
Construction Date and Builder / Engineer
1931 By Builder/Contractor: Unknown and Engineer/Design: Pennsylvania State Highway Department

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
110 Feet (33.5 Meters)
Structure Length
146 Feet (44.5 Meters)
Roadway Width
42.7 Feet (13.01 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge no longer exists!

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

This historic bridge was demolished and replaced in 2014!

This bridge was one of the most unusual examples of a skewed concrete to be encountered. Its uncommonly extreme skew was accommodated in an uncommon manner. The bridge was separated into a series of five  stepped rib-like arch sections that were offset from each other, forming the skewed configuration. The Historic Bridge Inventory, amazingly, dismissed this as not noteworthy. However, HistoricBridges.org strongly disagrees with such an assessment, since the design was a creative way of producing a skewed bridge without the complicated engineering and construction needed for a traditional, true skewed arch bridge. It is also far more rare than the phrase "less common" used by the Historic Bridge Inventory.

This bridge now joins the staggering number of historic bridges demolished by PennDOT in the 21st Century.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The single span, 146'-long, reinforced concrete deck arch bridge built in 1931 by the state highway department has five staggered, stepped ribs, a construction technique to accommodate the extreme skew. The technique has been used with masonry arches since ancient times, and it is not innovative or technologically noteworthy. The bridge is finished with concrete balustrades and paneled pilasters at the abutment corners. The arch rings and intrados are spalled with exposed reinforcing bars. The reinforced concrete deck arch type was widespread in Pennsylvania by 1910, and over 270 pre-1920 examples have been identified. This later example, although of a less common stepped construction to handle the skew, has no innovative or technologically noteworthy qualities.

Discussion of Surrounding Area

The bridge carries a 2 lane road with shoulders over 1 active track of the Union Railroad in an industrial area 2000' north of the Allegheny County Airport. A second track has been removed. The Union Railroad was the intra-plant railroad for US Steel. This section of the line from Monongahela Junction to Mifflin Junction was established in 1906.

Bridge Considered Historic By Survey: No


Photo Galleries and Videos: Lebanon Road Bridge

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Maps and Links: Lebanon Road Bridge

This historic bridge has been demolished. This map is shown for reference purposes only.

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