The Castle Divide ride is one of the classic mountain bike rides in Idaho. It's about 25 miles long, from Fourth of July Creek trailhead to the East Fork of the Salmon River. The entire route is technical and challenging, with an elevation gain of over 5,000 feet, and usually takes expert bikers 6 or 7 hours to complete.
Certainly one of the highlights of that ride is from the 10,000 foot Castle Divide summit, down toward Little Boulder Lakes. When you leave the summit, with its chewed up wooden sign, the largest mountain in the White Clouds is on your left. At 11,815 feet, Castle Peak towers over the other peaks, and has a fascinating history all its own.
We were there in August of 2014, shooting video for our Boulder-White Clouds story for OUTDOOR IDAHO's "50 Years of Wilderness."