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2012 Map of Twentyone Divide

Name: 2012 Topographic Map of Twentyone Divide
Creator: U.S. Geological Survey
Published: 2012
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2012

About this map

The Cheyenne River flows across this prairie landscape along the Wyoming and South Dakota border, a region defined by its wide drainage basins and sparse road network. The terrain is dominated by the Twentyone Divide, a prominent natural ridge that separates the local watersheds. To its south, the Twentyone Draw leads toward the river, illustrating the seasonal water movement that has shaped this ranching country.

Infrastructure is represented by a grid of rural routes such as Twp Hwy B and Co Hwy 9, which provide access to the vast open spaces between waterway junctions. Several tributaries, including Lone Tree Cr, Beaver Cr, and Pass Cr, create a complex hydrologic pattern that dictated early land use and settlement. This survey offers a clear view of the high plains topography before modern development or large-scale land changes altered the traditional paths of the river and its creeks.