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Dorrington Road Bridge

Dorrington Road Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: March 4, 2007 and July 10, 2009

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Key Facts

Facility Carried / Feature Intersected
Dorrington Road (PA-3117) Over Robinson Run
Ewingsville: Allegheny County, Pennsylvania: United States
Construction Date and Builder / Engineer
1888 By Builder/Contractor: Pittsburgh Bridge Company of Pittsburgh, Pennsylvania

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
55 Feet (16.8 Meters)
Structure Length
60 Feet (18.3 Meters)
Roadway Width
15.7 Feet (4.79 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 by PennDOT on August, 2009!

View the Historic Bridge Inspection Report for this bridge.

This bridge at a quick glance looks like a bedstead truss. It is however not a bedstead, although it still is extremely significant for its vertical end posts.

The Dorrington Road Bridge is a pin-connected Pratt pony truss bridge that is technologically noteworthy for having vertical endposts, giving it a distinct rectangular shape that in uncommon in truss bridge design. The bridge retains a significant level of historic integrity, meaning features that were present on the bridge in 1888 still remain today. Among the elements that remain in their original form are original lattice railings and a builder plaque, which are elements that are often missing from other truss bridges. The builder plaque on the bridge credits the Pittsburgh Bridge Company with building it in 1888 making it among the oldest bridges in Allegheny County, as only three other highway truss bridges on public roads in Allegheny County are known to be older than the Dorrington Road Bridge.

PennDOT is making plans and conducting studies for this bridge which is a process that invariably leads to plans for demolition and replacement. The only bit of hope present is that there is some regional interest in trying to relocate and preserve this bridge elsewhere. If a third party will step forward, realizing the significant value of this bridge, and relocate and preserve it elsewhere, there may be a future for this bridge.

The Dorrington Road Bridge will only become more rare and significant as time passes and more truss bridges elsewhere are demolished. The number of 19th century metal truss bridges is rapidly declining, as local road agencies and departments of transportation elect to demolish the aging structures. Indeed, this will almost certainly be the fate of the Dorrington Road Bridge if a third party does not come forward to relocate the bridge. The relocation and restoration of the Dorrington Road Bridge will save an important example of this beautiful structure type for future generations to enjoy. As a relocated pedestrian structure, people will be able to walk across the bridge and spend time enjoying and looking at the intricate structure. Money spent preserving the historic Dorrington Road Bridge for pedestrian traffic will be money well spent, as this bridge could become an important tourist destination in the future.


Photo Galleries and Videos: Dorrington Road Bridge

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Summer Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos, taken in 2009 on a sunny summer day. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
Summer Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos, taken in 2009 on a sunny summer day. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
Winter Bridge Photo-Documentation
A collection of overview and detail photos, taken in 2007 on a cloudy winter day. This photo gallery contains a combination of Original Size photos and Mobile Optimized photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer


Maps and Links: Dorrington Road Bridge

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

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