This mostly gravel trail connects Mount Rushmore to the Centennial Trail in the Black Elk Wilderness. A moderately strenuous trail, equestrian users, hikers, and wildlife observers will all find something to enjoy. There are several small water crossings, a wooden bridge, several horse tie-up stations, and two picnic tables to enhance recreational enjoyment. Although dogs are allowed on the trail, they are not allowed into the monument. You can start at the monument and do an out an back on Blackberry alone. Another option is to start at Horsethief lake and take the Centennial to Blackberry and back which would give you total mileage of approximately 8.5 miles.