Each fall (September and October), hundreds of elk congregate in the Slippery Ann Wildlife Viewing Area, creating a spectacle not to be missed at the Charles M. Russell National Wildlife Refuge. Hundreds of elk congregate here during the fall rut offering spectacular wildlife viewing opportunities. Large herds are visible around dawn and dusk displaying typical behavior of the rutting season. The Slippery Ann Wildlife Viewing Area is along an excellent 20-mile long self-guided tour which may be accessed from two points along Highway 191 on the west side of the Refuge and takes about 2 hours to complete. The tour route follows an all-weather gravel road that parallels the Missouri River before climbing out onto upland prairie and rolling rangeland. This tour will take you near Lewis and Clark's May 22, 1805, campsite as well as the wildlife viewing area. Make sure you carry plenty of water with you on the refuge there is no drinking water available along the route.