The southern
boundary follows the Idaho-Montana border from Lemhi Pass along the Continental
Divide (Centennial Mountains included) to Reynolds Pass. The eastern zone
line continues along the Beaverhead/Gallatin National Forest boundary
to north of Ennis where the Gallatin boundary intersects the Madison County
line. The zone then follows the Madison County line to east of Whitehall
and along the Deerlodge/Helena Forest boundary until Interstate 15 is
intersected. The west boundary is identical to the east boundary of the
Deerlodge/western Beaverhead National Forest zone.
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