This truss bridge is unusual because not only does the top chord follow a polygonal shape, the bottom chord also follows the same polygonal design, and the deck also follows an arched or "humpback" configuration as a result. Single span pony truss bridges like this bridge most commonly have horizontal bottom chords, and horizontal decks, therefore these details are unusual. They also give the bridge a unique visual appearance as seen in the above photo, where the whole truss has an arch-like appearance to it. Among the many truss bridges in this county, this bridge is also noted for its lack of alteration.
For a pony truss built before 1915, the 104 foot span length is also fairly long compared to typical pony truss lengths for pre-1915 truss bridges. Pony truss spans in excess of 100 feet became more common after 1920.
Information and Findings From New Jersey's Historic Bridge Inventory
Discussion of Bridge
The cambered ten panel Warren with verticals pony truss bridge is riveted. It is supported on concrete abutments and wing walls. The curved top chord is a built-up box member. Outriggers are original. Lacing on diagonal members is riveted to the outside edge of the angle. Alterations are minimal. Strengthening plates have been added to the bottom chord. Stringers and deck are replacements. The NJ Transit Historic Railroad Bridge Survey recommended that the bridge be ineligible.
Discussion of Surrounding Area
The one lane pony truss bridge carries Mountain Road over one line of Raritan Valley Line track. Originally two lines of track were crossed. It is located in a wooded sparsely settled area, immediately adjacent to an intersection.
Bridge Considered Historic By Survey: No
Original / Full Size Photos
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