Lehigh River - Glendon, Pennsylvania, USA

All photos by David Denenberg. Please do not reuse without permission. I visited this bridge with Patrick S. O'Donnell in March of 2007. Neither of us had seen this bridge "close up" before and we were surprised to see twisted-strand cables on a bridge constructed in 1857 and we thought, perhaps, the cable had been upgraded at some point, but the National Park Service page for this bridge notes: "When built, the bridge was one of the early uses of stranded cable for bridge construction." The same page also describes the function of a Change Bridge: "a special structure with an underpass that allowed mules towing canal boats to move, cloverleaf style, from one side of the canal to the other without unhitching."

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