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2015 Map of Iona NW

Name: 2015 Topographic Map of Iona NW
Creator: U.S. Geological Survey
Published: 2015
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2015

About this map

The Missouri River snakes through the heart of this landscape, forming a dramatic boundary between Brule and Lyman counties. This reach of the river includes the expansive Lake Francis Case, a prominent waterway that dominates the southern and western portions of the quadrangle. To the north, the confluence of the White River and the Missouri creates a complex system of islands and lowland terrain, most notably Bird Island. The topography is defined by the sharp transition from the elevated plains to the fertile Peterson Bottoms.

Local access is maintained through a network of rural routes such as Canyon Rd and Water Hole Rd, which navigate the draws and bluffs leading down to the water. Numerous small drainages like Bull Cr, Peterson Cr, and Nicholas Cr dissect the uplands, illustrating the hydrologic patterns that have shaped this portion of South Dakota. The map captures a largely undeveloped riparian environment where the primary features are the river itself and the named landmarks that define the cattle and ranching country of the Great Plains.