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Rock School Bridge

Rock School Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 3, 2013

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Key Facts

Facility Carried / Feature Intersected
Rock School Road (TR-346) Over Aunt Clara Fork Kings Creek
Rural: Washington County, Pennsylvania: United States
Construction Date and Builder / Engineer
1902 By Builder/Contractor: Nelson and Buchanan of Chambersburg, Pennsylvania

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
40 Feet (12.2 Meters)
Structure Length
44 Feet (13.4 Meters)
Roadway Width
11.5 Feet (3.51 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 bridge is a good unaltered example of a Queenpost pony truss. Southwestern Pennsylvania has (or had) an unusually large number of Queenpost pony truss bridges, which are usually a rare bridge type. Of the several that could be found in this region, this particular bridge stands out for its lack of alteration. The bridge has been closed to traffic, and a rather crude method of barricading the bridge was employed, where the timber deck was pulled up and stood up at each end of the bridge.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The 44' long and 12' wide, light, riveted Pratt pony truss built in 1902 is supported on ashlar abutments with wingwalls. The bridge has no innovative or distinctive details, and although it appears to be complete, it is an example of the standardizations of metal truss bridges that occurred by the late 19th century. The field connections are both bolts and rivets. Riveted field connections in Pennsylvania date to at least the late 19th century. Neither the bridge nor its setting are historically or technologically significant. There are over 25 metal truss bridges from 1887 through 1935 in Washington County. There are also many early 1900s Nelson & Buchanan pony truss bridges in the county.

Discussion of Surrounding Area

The bridge carries one lane of a two-lane road over a stream in a sparsely developed, wooded setting with some trailers. The area does not appear to be a potential historic district.

Bridge Considered Historic By Survey: No


Photo Galleries and Videos: Rock School Bridge

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Maps and Links: Rock School Bridge

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

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