Bordered for 9 miles by the Missouri River and Lewis & Clark Lake; the SITE includes mixed woods, grasslands and marshy areas. This area is extensively marshy, as it includes the area where the Missouri River is impounded to form the upper end of Lewis and Clark Lake, Thus, many wetland birds are present. Shorebirds and waders can congregate here when the sandbars and mudflats emerge near where the Niobrara River flows into the Missouri River during migration seasons.