(1) The designated surveillance area (DSA) of Montana is described as:

(a) Park County– south of Interstate 90;

(b) Gallatin County – south of Interstate 90 from Park-Gallatin County line to Bozeman, then south of Highway 84 from Bozeman to Gallatin-Madison County line;

(c) Madison County – south of Highway 84 from Gallatin-Madison County line to Norris, then east of U.S. Highway 287 from Norris to Ennis, then south of State Highway 287 from Ennis to Alder, then east of State Rd. 357 (Upper Ruby Road - becomes Centennial Divide Road) to Madison-Beaverhead County line; and

(d) Beaverhead County – from Madison-Beaverhead County line, east of Forest Route 100 (becomes Road 204 - Gravelly Range Road), continuing east of 204 to Stibel Lane (Road 202) - south of South Valley Rd. (State Road 509) approximately 1 mile, then east of Price Peet Rd. (Road 207) running south to the Montana/Idaho border.