This is a truly unique bridge, with no other similar bridge known to exist. The three span truss bridge consists of what is essentially a pony truss span at each end with a through truss center span. The shape of the trusses gives the bridge a continuous of cantilever appearance. However, the bridge functions as simple truss spans, and the unusually shaped trusses were apparently only built as such to facilitate construction. Looking at the bridge at the ends of the through truss there is a pin, and also empty rivet holes, both at the pin connection and on the adjacent vertical. HAER documentation indicates this bridge was built as a thru truss using cantilever method, with the detail at the pin-connection functioning as a rigid riveted connection enabling construction of the main span via cantilever method thereby avoiding falsework. Afterwards, the riveted connection was removed (explains the empty rivet holes), the pin connection retained, so now the bridge functions as three simple truss spans. Thus, the bridge is not continuous, nor is it a cantilever truss. HAER docs note the bridge was designed by engineers in a single day. If this is true, it seems appropriate to assume this fast turnaround time was made possible because there must have been a state standard Pennsylvania truss and maybe Warren pony truss plan that the engineers must have adapted into this unique design.
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