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Although widened with concrete on one side, the original portion of this bridge is an exceedingly rare example of a helicoidal arch, the most advanced way to produce a skewed stone arch bridge. Rather than offseting the courses of stone, the simpler and more common way to skew a stone arch, a helicoidal arch had carefully cut stones that allow for a true skew with a smooth arch barrel. This required cutting each stone in the barrel to an exact curve, and as such a bridge like this represents the finest in masonry craftsmanship. Less than 10 helicoidal arch bridges have been identified in the United States. Even in the United Kingdom, where more exist, they are uncommon.
Some period postcards hailed this bridge as "First of Its Kind In America" however this is untrue as earlier examples are found in Pennsylvania dating decades earlier, dating to 1832 and 1857 and a ca. 1846 example is identified in Connecticut.
This bridge still carries 30-40 trains every day.
Above: Historical postcard showing bridge.
Above: Historical postcard showing bridge.
This bridge is tagged with the following special condition(s): Unorganized Photos and Helicoidal Arch
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