High Quality Content by WIKIPEDIA articles! New York State Route 9M (NY 9M) was a state highway in Warren County, New York, United States. It was a spur route of U.S. Route 9 (US 9) that largely followed the eastern bank of the Schroon River. The southern terminus of the route was at NY 8 in the town of Horicon near the hamlet of Starbuckville. Its northern terminus was at US 9 in the Chester hamlet of Pottersville. NY 9M was known as East Schroon River Road and Glendale Road and crossed over the southern tip of Schroon Lake.