Five trailheads provide access to the Centennial Trail in the northern Black Hills.The five trailheads are the Alkali Creek Trailhead, Elk Creek Trailhead, Dalton Lake Trailhead, South Boxelder Trailhead, and the Pilot Knob Trailhead. The north portion of the Centennial Trail is approximately 37 miles long, and is open for hiking, backpacking, horseback riding, and mountain biking. Off Highway Vehicles (OHV) less than or equal to 62 inches in width are allowed on the Centennial Trail between the Dalton Lake Trailhead and the Pilot Knob Trailhead.