In addition to the definitions in s. NR 51.002, the following definition applies to this subchapter: "Bluff" means a hill, ridge or similar landform significantly elevated above the surrounding landscape, having a broad, steep face or cliff, and adjoining the shoreline or coastal lowlands of Lake Michigan or Lake Superior. "Bluff" includes an elevated landform having a steep face or bedrock cliff associated with the escarpment of Niagara dolomite within 6 miles of the Lake Michigan shoreline in Door and Brown counties.
Wis. Admin. Code Department of Natural Resources NR 51.32