Northwestern South Dakota Birding Sites NW BH SC Cen NC NE EC SE The Northwest region is home to the Grand River National Grasslands, home to rare mixed-grass prairie birds. Shadehill Reservoir offers a rare large body of water for migrants, while draws and canyons have nesting woodland birds. Picturesque SlimButtes offer summer and migration birds, as winters are too harsh for most birds. There are few towns in this remote area, so the small towns of Buffalo and Bison are headquarters for birding folks. eBird Hotspot Other Birding Hotspot Powered By Subgurim(http://googlemaps.subgurim.net).Google Maps ASP.NET Belle Fourche NWR - Butte Co. Grand River National Grassland - Perkins Co.