The Oglala National Grassland covers about 94,500 acres of badlands, buttes and mixed-grass prairie in northern Sioux County and western Dawes County. It is managed by the Pine Ridge Ranger District of the U.S. Forest Service from Chadron. It includes Toadstool Geologic Park, with its badlands loop trail and 12-site campground, and the Hudson-Meng Education and Research Center, a 10,000-year-old bison bonebed open on summer Fridays. Most of it is reached from NE 2/71 and Toadstool Road north of Crawford; dirt roads are very hard to drive when wet. Office: 125 N. Main St., Chadron; (308) 432-0300.