Hiking

The hiking areas within the Challis Field Office are dispersed and unmarked. Adventurous visitors are encouraged to explore the approximately 250 miles of open routes available in the mountains of the Mackay/Lost River Valley area. This area includes hikes to view spectacular vistas from 9 of the 11 highest peaks in Idaho. Check your local bookstore for hiking guides that cover this area.

Lost River Access Trail (Non-Motorized): Mackay Area

This new (as of 2008) loop trail system includes a 3/4-mile trail designed for maximum accessibility (grade and slope) from the trailhead down to the Big Lost River.  For those wanting a more arduous hike and a spectacular view of Mt. Caleb, a side trail, also 3/4-mile hike, provides the second half of the loop.