The roadways grow far apart over the next mile before coming together again at the NY 134 exit, as Turkey Mountain, one of the Manhattan Hills, looms ahead. The Taconic then enters Yorktown, the last town along the Taconic in Westchester County, and split again until they are apart, with neighborhoods and houses between them, to the two bridges over New Croton Reservoir, part of the New York City water supply system. Once on the other side, in the town of Yorktown, they converge again to their previous width. The next exit, at Underhill Avenue, provides access to downtown Yorktown and the reservoir.