The Stone Arch Bridge is a stone arch railroad bridge located in Keene, Cheshire County, New Hampshire, United States. The bridge was built in 1847 with a span length of 90 feet (27 m). From the Keene Public Library's description of the postcard shown: "An enduring example of the excellence which characterized the construction of the Cheshire Railroad. It was designed by Lucian Tilton. The stone came from a quarry on the Thompson farm, within a half-mile of the bridge. The keystone was set Dec. 9, 1846. The removal of the original parapet and the substitution of an iron railing has detracted somewhat from its beauty."