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Avonmore Bridge

Avonmore Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: August 1, 2007

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Key Facts

Facility Carried / Feature Intersected
6th Street (PA-156) Over Kiskiminetas River
Location
Avonmore: Armstrong County, Pennsylvania and Westmoreland County, Pennsylvania: United States
Structure Type
Metal 11 Panel Rivet-Connected Parker Through Truss, Fixed and Approach Spans: Metal 5 Panel Rivet-Connected Pratt Full-Slope Pony Truss, Fixed
Construction Date and Builder / Engineer
1937 By Builder/Contractor: Unknown and Engineer/Design: Pennsylvania State Highway Department

Technical Facts

Rehabilitation Date
1985
Main Span Length
218 Feet (66.45 Meters)
Structure Length
571 Feet (174.04 Meters)
Roadway Width
19 Feet (5.79 Meters)
Spans
2 Main Span(s) and 2 Approach Span(s)
NBI Number
640156004015280

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge is unusual because it was built in the 1930s but does not follow the standard plan for truss bridges seen in Pennsylvania. The Pennsylvania Historic Bridge Inventory incorrectly reports that this bridge has built-up end posts and top chord. In fact, the entire bridge's trusses are composed of rolled beams, which is what makes the bridge unusual both in appearance and design. The bridge has two Parker through truss spans, a full-slope Pratt pony truss approach span, and a steel stringer approach span.

The bridge appears in the movie Promise Land and can be seen in this trailer.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The bridge built in 1937 consists of 2, 215' long, riveted, Parker thru truss spans and a 91' long Pratt pony truss approach span on the south end and 41' long stringer span at the north approach. The main span trusses have built up upper chords and end posts, but the web members are all composed of rolled section. The trusses have no innovative or distinctive details. The cantilevered sidewalk is finished with metal railings. Neither the bridge nor its setting are historically or technologically significant. Many original rivets have been replaced with high-strength bolts.

Discussion of Surrounding Area

The bridge carries a 2 lane road and 1 sidewalk over the Kiskiminetas River at the Westmoreland-Armstrong county line. The north side of the bridge is wooded. The south side in Westmoreland County is a mix of altered and undistinguished early through late 20th century houses. The setting does not appear to have historic district potential.

Bridge Considered Historic By Survey: No

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Photo Galleries and Videos: Avonmore Bridge

 
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Bridge Photo-Documentation
A collection of overview and detail photos. 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

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