 The route passes several of the Catskill High Peaks, including Hunter Mountain, before dropping into the Hudson Valley via Kaaterskill Clove and ending at an intersection with U.S. Route 9W (US 9W) in the village of Catskill.NY 23A was assigned in the mid-1920s and has not been changed since.A portion of the route through Kaaterskill Clove was closed for several months in 2006 after landslides triggered by heavy rains damaged the route.