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2021 Map of Iron Post Buttes

Name: 2021 Topographic Map of Iron Post Buttes
Creator: U.S. Geological Survey
Published: 2021
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2021

About this map

Lake Oahe dominates this part of central South Dakota, where the reservoir floods the historic path of the Missouri River along the border of Stanley and Sully counties. The landscape rising west of the water is defined by the high, broken terrain of the Iron Post Buttes, a series of prominent formations that overlook the drainage basins of Mission Cr and Sunil Cr. This area retains its rural, open character, centered on the small settlement of Mission Ridge.

Old travel routes like Fort Bennett Rd and Agency Creek Rd trace the contours of the breaks, providing access to the expansive shoreline of the reservoir. The map documents the complex intersection of township and range lines across this riverine landscape, illustrating how modern water management has reshaped the traditional prairie environment while leaving landmarks like the buttes as permanent fixtures of the horizon.