Forest Service 156 is a hiking, biking, and horse trail in Pennington County, South Dakota. It is within Black Hills National Forest. It is 1.7 miles long and begins at 5,247 feet altitude. Traveling the entire trail is 3.5 miles with a total elevation gain of 660 feet. The Bullock Lookout Tower (elevation 5,892 feet) tower and Scruton Mountain (elevation 5,892 feet) can be seen along the trail.
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