Forest Route 665.1A is a hiking, biking, and horse trail in Custer County, South Dakota. It is within Black Hills National Forest. It is 1.2 miles long and begins at 5,537 feet altitude. Traveling the entire trail is 2.4 miles with a total elevation gain of 341 feet. The Tin Mountain Mine (elevation 5,682 feet) quarry can be seen along the trail.
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