Cobblestone Reservoir   Be the first to submit input for Cobblestone Reservoir. If you have info on Cobblestone Reservoir, Harding County, South Dakota please submit it here to improve this web site.          These outdoors activities are available near Cobblestone Reservoir.   Public Lands Near Cobblestone Reservoir: Theodore Roosevelt National Park, Medora - ND, 46 miles away   Campgrounds Near Cobblestone Reservoir: Picnic Spring Campground, Harding County, 4 miles away Butte View Campground, Bowman, 18 miles away   Hotels Near Cobblestone Reservoir: Super 8 Bowman, Bowman, 18 miles away Americinn - Medora, Nd, Medora, 48 miles away