The Reading Halls Station Bridge, Pennsdale, Pennsylvania 

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Built in 1846 the Reading-Halls Station Bridge was originally designed and used as a railroad bridge. The bridge is almost certainly the oldest all-metal truss bridge in active service in the United States, a lone survivor from the first series of all-metal trusses of any kind designed and constructed in the United States. This Howe pony truss bridge followed shortly after the construction in 1845 of the very first all-metal truss bridge, the West Manayunk Bridge, also designed by Richard B. Osborne and built by the Reading Railroad.
GPS Location: 41°14'08.7"N 76°49'57.0"W