Just outside Ogdensburg, NY 812 separates from NY 37 to continue northward to Canada over the Ogdensburg-Prescott International Bridge, where it becomes Highway 16 farther inland.
Although most of NY 37 in the town of Bombay is contained within the reservation, a short portion east of Hogansburg and the St. Regis River and west of Tarbell Road is located outside the reservation limits.