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Mountain Road Bridge

Mountain Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: November 8, 2015

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Key Facts

Facility Carried / Feature Intersected
Mountain Road Over Railroad (New Jersey Transit, Raritan Valley Line)
Rural: Hunterdon County, New Jersey: United States
Construction Date and Builder / Engineer
1910 By Builder/Contractor: Phoenix Bridge Company of Phoenixville, Pennsylvania

Technical Facts

Rehabilitation Date
Main Span Length
104 Feet (31.7 Meters)
Structure Length
108 Feet (32.9 Meters)
Roadway Width
15 Feet (4.57 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

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


Photo Galleries and Videos: Mountain Road Bridge

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Maps and Links: Mountain Road Bridge

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