National Forest Development Road 320 is a hiking, biking, and horse trail in Shoshone County, Idaho. It is within Idaho Panhandle National Forests. It is 20.2 miles long and begins at 6,443 feet altitude. Traveling the entire trail is 40.9 miles with a total elevation gain of 11,542 feet. The Heller Grave (elevation 4,728 feet) grave yard can be seen along the trail.
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