High Quality Content by WIKIPEDIA articles! Schoharie Crossing State Historic Site, also known as Erie Canal National Historic Landmark, is a historic district that includes the ruins of the Erie Canal aqueduct over Schoharie Creek, and a 3.5-mile (5.6 km) long part of the Erie Canal, in the towns of Glen and Florida within Montgomery County, New York. It is the only part of the old canal that has been designated a National Historic Landmark.