Yalesville Underpass, Railroad underpass in Wallingford, Connecticut.
The Yalesville Underpass is a stone arch bridge in Wallingford that carries railroad tracks across Routes 150 and 71. The structure features a distinctive skew design where the arch spans diagonally at a 30-degree angle to the roadway.
William MacKenzie constructed this structure in 1838 for the Hartford and New Haven Railroad, making it an early example of skew arch engineering. The construction marked an important moment when railroads began crossing established local roads.
The underpass represents the evolution of American transportation infrastructure, demonstrating the intersection of railroad expansion with local road networks in Connecticut.
The passage is relatively narrow, so traffic lights regulate flow in both directions. Visitors should expect brief waits if vehicles are crossing from the opposite direction.
Every stone in the skew arch was individually cut and placed by hand with remarkable precision. This craftsmanship reveals the high technical skill that stone workers brought to their trade in the 1800s.
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