NY 145 was extended eastward along NY 23 from Cairo to Catskill . Both routes were realigned in the 1960s to follow a new arterial between Cairo and the Rip Van Winkle Bridge in Catskill. The first segment of the highway, a northerly bypass of the hamlet of Cairo, opened . The remainder of the arterial was completed in the mid-1960s. NY 145 was truncated back to Cairo on January 1, 1970. Much of NY 23's former routing between Cairo and the Catskill village line is now CR 23B; however, a segment in Jefferson Heights between exit 21 of the New York State Thruway and a town road named Austin Acres is state-maintained as NY 911V, an unsigned reference route.