2017 Map of Iona NW

About this map

The confluence of the White River and the Missouri River dominates this landscape along the border of Lyman and Brule Counties. The vast waters of Lake Francis Case fill the river valley, a consequence of mid-century damming that significantly altered the original river channel. The map illustrates the dramatic relief of the Missouri breaks, where steep bluffs descend into areas like Peterson Bottoms and former river features such as Bird Island.