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Portersville Road Bridge

Portersville Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: July 3, 2006

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Key Facts

Facility Carried / Feature Intersected
Portersville Road (PA-488) Over Slippery Rock Creek
Rural: Lawrence County, Pennsylvania: United States
Construction Date and Builder / Engineer
1932 By Builder/Contractor: Unknown and Engineer/Design: Pennsylvania State Highway Department

Technical Facts

Rehabilitation Date
Main Span Length
155 Feet (47.2 Meters)
Structure Length
310 Feet (94.5 Meters)
Roadway Width
23.6 Feet (7.19 Meters)
2 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge no longer exists!

Bridge Status: Demolished and replaced ca. 2017-2018

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

This bridge is a heavily skewed state standard plan truss bridge. V-lacing is only present on the overhead bracing, and lattice is only under the top chord, while vertical and diagonal members are rolled i-beams. Pennsylvania had a wide variety of "standard plan" metal truss bridges, and this design appears to be the last of the through truss designs. The later design is visually distinguished by a less complex appearance, but with many examples that have heavy, and easily noticeable skews and impressive portal bracing with an imposing appearance. These visually pleasing bridges are an asset to Pennsylvania's landscape even if PennDOT does not see them as such.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The skewed, two-span, 310'-long, riveted Pratt thru truss bridge built in 1932 is supported on an ashlar substructure with concrete caps. The upper chords and end posts are built up box sections, and the diagonal members are rolled section. Lower chords are toe in channels with stay plates. The cantilevered sidewalk is finished with a metal lattice railing. Safety shape barriers were placed inside the truss lines in 1984. The bridge has no distinctive or innovative details, and neither it nor its setting are historically or technologically significant.

Discussion of Surrounding Area

The bridge carries a two-lane road and a sidewalk over a stream in a sparsely developed, rural area with post-World War II houses on both sides of the bridge.

Bridge Considered Historic By Survey: No


Photo Galleries and Videos: Portersville Road Bridge

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Maps and Links: Portersville Road Bridge

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

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