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2012 Map of Brennan Flat

Name: 2012 Topographic Map of Brennan Flat
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 winds through this section of Pennington County, defining a landscape of broad terraces and carved drainage systems. Named topographical features like Brennan Flat and Holcomb Flat occupy the higher ground above the river valley, reflecting the traditional ranching and open-range character of western South Dakota. These flats are dissected by several named coulees and intermittent streams, including Farnum Draw, Timber Draw, and Anderson Draw.

A network of section-line roads and named routes, such as Owanka Rd and Trevillyan Rd, provides access across the arid terrain. Smaller tributaries like Beaver Cr and Bear Cr feed into the primary river channel, highlighting the importance of seasonal water management in this sparsely populated environment. The map captures the region in the early 21st century, showing the persistence of rural land divisions and family-named landmarks.