Section 3 of the CDT that runs along the Idaho/Montana border runs for 30.6 miles from Red Rock Pass Road to the Ching Moose Road Trailhead. Along the way, the trail crosses the Idaho/Montana border several times and passes Nemesis Mountain, Hell Roaring Creek, Lilian Lake, Blair Lake, the Centennial Mountains, and Taylor Mountain.
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http://www.tripleblaze.com/trail.php?c=3&i=5181