- Butte, Camas, Cassia, Clark, Fremont, Gooding, Jefferson, Jerome, Lemhi, Lincoln, Madison, Minidoka, Power and Teton counties.
- Bannock County west of Interstate 15.
- Bingham County west of Interstate 15.
- Blaine County, except within the Salmon River drainage.
- Bonneville County west of Interstate 15 and north of U.S. Highway 26.
- Custer County, except within the Salmon River drainage upstream from and including Valley Creek.
- Elmore County south and east of U.S. Highway 20 and north of Interstate 84.
- Oeida County west of Interstate 15.
- Owyhee County west of the Bruneau River.
- Twin Falls County east of U.S. Highway 93.
- All areas not included in Area 2.