Elevation drops slightly upon reaching the hamlet of Grand Gorge within the town of Roxbury, located just above a small pond alongside NY 30 that gives rise to the Delaware's East Branch. NY 23 intersects NY 30 in the hamlet's center before making a sharp bend to the south as it approaches the Schoharie Reservoir, located southeast of Grand Gorge. The route passes by the reservoir's southern tip before it enters Greene County and the town of Prattsville. Just inside the county, a bridge carries the highway over Schoharie Creek and into the next community, the hamlet of Prattsville. Pratt Rock, a series of rock carvings depicting the life of Zadock Pratt—the tanner and politician who lent his name to the town—is located just east of the hamlet.