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Estep Bridge

Estep Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 5, 2013

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Key Facts

Facility Carried / Feature Intersected
Snee Road (TR-844) Over Peters Creek
Rural: Washington County, Pennsylvania: United States
Construction Date and Builder / Engineer
By Builder/Contractor: Penn Bridge Company of Beaver Falls, Pennsylvania

Technical Facts

Rehabilitation Date
Main Span Length
64 Feet (19.5 Meters)
Structure Length
68 Feet (20.7 Meters)
Roadway Width
13.8 Feet (4.21 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

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

Although the Historic Bridge Inventory thought this bridge might have been built by the Groton Bridge Company, it is clearly the product of the Penn Bridge Company. It has the unusual detail of two pins at the ends of the top chord, one for the diagonal member, and one for the vertical member. Also, the hanger detail where it connects to the vertical member via a single bolt and nut is an unusual detail. This detail appears on other Penn Bridge Company bridges from the 1880s. The National Bridge Inventory construction date of 1912 may refer to a relocation of this bridge, and/or reconstruction of the abutments as concrete. Timber bents have been added to bear the load, rendering the trusses somewhat decorative in function today.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The single-span, 68'-long, pin-connected Pratt pony truss bridge is supported on stone abutments. It dates stylistically to ca. 1895, and has details that suggest it may have been fabricated by the Groton Bridge Co. The trusses are traditionally composed, and there are two unusual details. Two pins are used at the upper hip panel point, and the back-to-back angles of the verticals flare to accommodate a rivet-connected triangular-shaped pin plate for the lower panel points. The floor beams are built up. The bridge is remarkably complete, and it represents the experimentation in design that of the early days of metal truss bridges. The span is historically and technologically significant. A wood helper bent has been added at an unknown date.

Discussion of Surrounding Area

The bridge carries a one lane of an unimproved road over a stream in a sparsely developed, wooded setting with scattered residential development.

Bridge Considered Historic By Survey: Yes


Photo Galleries and Videos: Estep Bridge

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