Just after Ossining, NY 9A returns and merges with US 9 for approximately 1,500 feet (457 m) as it crosses the mouth of the Croton River and becomes the Croton Expressway. The only section built of the cancelled I-487, the highway is generally built to interstate standards. NY 9A leaves the freeway and returns to two lanes, following the parent route's old course, at the second exit in Croton-on-Hudson, where NY 129 reaches its western end. US 9 passes the Indian Point Energy Center, a nuclear power-plant that supplies power to Westchester County and New York City. The facility is visible from the majority of the northern half of the expressway.