7 just northeast of downtown to follow James F. Lettis Highway, a four-lane divided highway, south into the southern half of the city. As it heads south on the arterial, it connects to Interstate 88 (I-88) at an interchange on the northern bank of the Susquehanna River. NY 28—which overlaps with I-88 from Oneonta to exit 17 northeast of the city—leaves the freeway here, following NY 23 across the river to a large commercial district on the south bank. NY 28 leaves NY 23 here to proceed to the southwest while NY 23 goes eastward past several large strip malls and big-box retailers on its way out of both Oneonta and Otsego County. Catskills In the adjacent Delaware County, NY 23 initially follows a generally easterly routing through the Charlotte Creek valley. Here, the land gets more forested and the number of houses decrease as it crosses the county. After Davenport, a hamlet east of Oneonta, the road begins to climb onto the Catskill Plateau. By the time it intersects NY 10 at the village of Stamford, it has already reached an elevation of above sea level. Not far to the east of the NY 10 junction, it crosses the West Branch of the Delaware River, by this point a small brook as the river's source is located just to the north. It maintains this elevation during a brief, foray into Schoharie County that leads the route around a pair of mountains situated south of the county line. 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. Southeast of Prattsville hamlet, NY 23A splits off from NY 23 to continue along Schoharie Creek while the latter climbs in elevation again along