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This is an unusual pony truss bridge because it is a highway bridge with truss members and chords composed of angles (no v-lacing or lattice), and the top chord and end post have plate stiffening included. This member/chord design is normally only found on bridges designed by the railroad bridges, often for highway over railroad bridges. The builder of the bridge is not confirmed, but a missing plaque is evident by the plaque scar left behind on the end post. It is in the unusual shape of an angled parallelogram type shape, which was an unusual plaque shape that Nelson and Buchanan of Chambersburg, Pennsylvania used, which would seem to suggest this company built the bridge. The company was prolific in this part of Pennsylvania. However, this company's bridges built during the early 1900s did not have built-up beams that follow this railroad design. It is not known what the story is here. If Nelson and Buchanan did build the bridge, was it an unusual experiment with a different bridge design for the company? Or perhaps is this bridge actually older than it seems, a used railroad bridge that was replaced and purchased by the company and resold as a "used bridge?" The mystery remains.
Information and Findings From Pennsylvania's Historic Bridge InventoryDiscussion of Bridge The skewed, single-span, 47'-long and 12' wide riveted Pratt pony truss bridge built in 1904 is supported on concrete abutments. The trusses are composed of back to back angles. Plate between the angles is used for the gussets and stiffening of the upper chords and end posts. The outriggers are original as are the laced railings placed inside the truss lines. The bridge exhibits no distinctive or innovative details, and it is located in a county and region with a deep and varied collection of metal truss bridges. Neither the bridge nor its setting are historically or technologically significant. There are over 35 metal truss bridges in Washington County alone, and it is the early examples of types and designs that are significant. Discussion of Surrounding Area The bridge carries a single lane road over a stream in a sparsely developed, wooded setting with one modern house. Bridge Considered Historic By Survey: No |
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