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Dunbar Bridge

Valleyview Road Bridge

Dunbar Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: July 4, 2006 and May 3, 2013

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
Valleyview Road (TR-839) Over Raccoon Creek
Location
Rural: Washington County, Pennsylvania: United States
Construction Date and Builder / Engineer
1905 By Builder/Contractor: Fort Pitt Bridge Works of Pittsburgh, Pennsylvania

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
54 Feet (16 Meters)
Structure Length
59 Feet (18 Meters)
Roadway Width
10.2 Feet (3.11 Meters)
Spans
1 Main Span(s)
NBI Number
627223083940130

Historic Significance Rating (HSR)

Bridge Documentation

This bridge no longer exists!

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

This bridge is a bit different looking than the other pony trusses, an observation that the historic bridge inventory didn't care to mention. Actually, they must not have even visited the bridge, as they didn't list the builder, which is clearly visible on builder plaques on the bridge. The bridge retains a high degree of historic integrity, and is a good example of an early rivet-connected truss bridge in Pennsylvania. An unusual fact is the plaques on this bridge are the same as those used by the Pittsburgh Bridge Company and its agents who later became their own company, Nelson and Buchanan. This bridge was built by the Fort Pitt Bridge Works, however.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The single-span, 59'-long and 13' wide, riveted Pratt pony truss bridge built in 1904 is supported on concrete abutments with wingwalls that have been placed in front of ashlar abutments. The trusses are traditionally composed. Lateral stability is provided by original outriggers, and the original short laced railings are in place inside the truss lines. The bridge exhibits no unusual or distinctive details. It reflects the standardization of truss bridges that came to dominate after 1895. Riveted field connections were common by 1900. Neither the bridge nor its contexts are historically or technologically significant.

Discussion of Surrounding Area

The bridge carries one lane of a two-lane road over a stream in a rural area of active farms.

Bridge Considered Historic By Survey: No

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Photo Galleries and Videos: Dunbar Bridge

 
View Photo Gallery
2006 Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. 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
2006 Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
2013 Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. 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
2013 Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Video
CarCam: Westbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.
View Video
CarCam: Eastbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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Maps and Links: Dunbar Bridge

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

Coordinates (Latitude, Longitude):

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Bridgehunter.com: View listed bridges within a half mile of this bridge.

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