In the 1920s, the Ridgefield to North Salem route was a primary state highway designated as Highway 146. In the 1932 state highway renumbering, Highway 146 became incorporated into the newly established Route 33. In 1966, Route 33 was shortened to end at Route 35 in Ridgefield center and the piece west of Route 35 was renumbered to Route 116 in order to match the route number in New York.