2012 Map of Iron Post Buttes

About this map

Lake Oahe dominates the eastern half of this Stanley County landscape, its expansive waters defining a complex shoreline where the prairie meets the reservoir. Rising above the western drainage basins, the Iron Post Buttes serve as a primary topographic landmark for the region. The map captures a moment in the early 21st century where the vast Missouri River impoundment has reshaped the local geography, creating deep inlets at the mouths of Sand Cr and Mission Cr. This transition from high plains to water-level and riparian systems is further evidenced by the course of Agency Cr in the south. Human footprint in this area remains sparse and largely agricultural, centered on established sites like the Donelan Ranch, reflecting the enduring ranching character of central South Dakota.