AMP: 8 Location: Old Colony Rd and Main St, Wallingford As 71 joins 150, we’ll cross under this 1838 skew arch rail underpass, known as the Yalesville Underpass. This is supposedly the first skewed underpass in the entire USA. AMP: 8 Location: Old Colony Rd and S Broad St, Wallingford As we pass under the … Continue reading Connecticut Route 150, CT 71 to CT 71