East Rim

East Rim, also known as Bulldog Canyon Road, is a seasonal Forest Service road near Sturgis, South Dakota. It consists mainly of rough dirt, with spots of embedded rock less than a foot tall and spots with loose shale and softball-sized rocks. There are several short hill climbs and descents, with the steepest at 12 degrees. East Rim is suitable for stock 4x4 vehicles. Visitors can expect to see vistas of the surrounding Black Hills, the nearby plains, and views of Bear Butte across the plains. Be sure to look out for the natural arch in the cliffside at the eastern end of this route. The Centennial Hiking trail also crosses East Rim.

East Rim offers multiple small pull-outs suitable for a single vehicle to camp with a ground or vehicle-based tent. Branch 139.1A ends in a large clearing that can accommodate several vehicles and tents. At the intersection of 139.1 and 139.1A, there is a large gravel trailhead also suitable for camping and trailers. 139.1 west from this trailhead to Vanocker Canyon Road is well-maintained gravel, so those wishing to trailer vehicles may find this a suitable area to park. Open fires are not allowed in the Black Hills National Forest.