8 miles, almost all single track. The first segment is repeated at the end of the ride.
From Rapid City, take Sheridan Lake Road to mile marker 8. Turn Right onto Victoria Lake Road. Go 1.5 miles to First Thunder Road. Park here on the right side of road. The start of the trail is right across the road from the parking area. There are some intersections on this trail so it is best to go with someone who knows the trail.
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