The Cornwall Bridge is a two-lane, concrete arch bridge carrying U.S. Route 7/Connecticut Route 4 over the Housatonic River and the Housatonic Railroad in northwestern Connecticut. It was built in 1930 by C.W. Blakeslee and Sons for the Connecticut Highway Department and consists of six open-spandrel arches spanning 674 feet (205 m), and is a fairly large example of concrete open-spandrel construction. The bridge was reconstructed in 1994 and was listed on the National Register of Historic Places in 2004.