Yalesville Underpass
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The Yalesville Underpass is a 30 degree skew arch at the intersections of Routes 150 and 71 in Wallingford, Connecticut. Built in 1838 for the railroad by William MacKenzie, it is reported to be the first skew arch underpass in America. The central arch allowed tall hay wagons to pass through. The stone structure is also one of the oldest stone railroad bridges in America.
A point of interest of this underpass is its width allows only one car to pass at a time, which is controlled by a 2-way stoplight.
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