NY 151 began at the intersection of Third Avenue (then-NY 152) and High Street in Rensselaer and followed the length of High Street and Red Mill Road to where it merged with its current alignment southeast of the city. West of High Street, what is now NY 151 was the westernmost portion of NY 152. NY 152 was truncated to Defreestville on its western end . Its former routing along Third Avenue from Rensselaer to Defreestville was redesignated as NY 381. NY 381 was supplanted by a rerouted NY 43 in the late 1960s. In the late 1970s, NY 151 was rerouted off High Street and onto a new roadway, Barracks Road, in the vicinity of Rensselaer. As a result, the roadway no longer entered the Rensselaer city limits. It was re-extended into the city by way of Third Avenue in the late 1990s when NY 43 was rerouted to meet I-90 at the new exit 8 west of Defreestville. Like NY 43 before it, NY 151 terminated at an interchange linking Third Avenue to US 9 and US 20. Major intersections See also References External links 151 Transportation in Rensselaer County, New York