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2020 Map of Thompson Coulee

Name: 2020 Topographic Map of Thompson Coulee
Creator: U.S. Geological Survey
Published: 2020
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2020

About this map

Knox Ridge and Snell Ridge dominate this high-plains landscape in Fergus County, Montana, where the terrain is deeply incised by a network of seasonal drainages and coulees. The map illustrates the hydrological patterns of the area, defined by the winding course of Armells Cr and its tributaries, including Dry Armells Cr and Sourdough Cr.

Remote and largely undeveloped at this time, the area is accessible primarily via the unpaved Knox Ridge Rd, which follows the high ground between watersheds. The land is divided into clear sections of the Public Land Survey System, including t21n r22e and t20n r21e. This survey serves as a record of the intricate topographical features such as Sawmill Coulee, Antelope Coulee, and the namesake Thompson Coulee, providing essential detail for understanding the drainage systems and livestock-grazing landscape of central Montana.