2017 Map of Iron Post Buttes SW

About this map

Lake Oahe and the Missouri River define the eastern boundary of this central South Dakota landscape, where the waters of the Oahe Reservoir have reshaped the Missouri's original channel along the border of Sully and Stanley Counties. The topography is characterized by a series of significant drainage systems that carve through the prairie towards the river, including the expansive reach of Chantier Creek in the south and Snake Cr further north. Long-established travel routes like Mission Ridge Rd and Agency Creek Rd traverse the upland divides, providing a glimpse into the modern infrastructure of this rural ranching region. The map details the complex shoreline of the reservoir, where narrow inlets now occupy the lower valleys of Deep Cr and other tributaries, creating a distinctive dendritic pattern along the river valley.