Dispersed Camping off the main road thru Custer State Park that is National Forest. Turn on the road that marks the Bob Marshall Camp. You pass a water treatment area and go thru the gate. It is open to vehicles in the summer and equestrian and hike in during the winter. Road is rough but was passable in our truck. We towed in a small teardrop but I wouldn't recommend a large rig. There are several areas to set up camp but pack in and pack out! No water sources spotted so bring enough in with you (didn't even see any water for filtering). Saw a preexisting stone fire pit from past campers too. Super quiet and near all the great things of Custer. We did experience biting flies. Coordinates: 43.7851324, -103.5041771