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2017 Map of Donleys Reservoir

Name: 2017 Topographic Map of Donleys Reservoir
Creator: U.S. Geological Survey
Published: 2017
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2017

About this map

Donleys Reservoir sits as a central water source in this part of Rosebud County, where the high plains are carved by a network of seasonal drainages and coulees. The landscape is defined by the winding course of Big Porcupine Cr and its tributaries, including Longfork Cr and Living Ash Cr. These waterways historically dictated the movement of livestock and the placement of early ranching infrastructure in eastern Montana.

Surface features like Larson Coulee and Machine Coulee illustrate the erosional patterns of the drainage basin north of the Yellowstone River. Human imprints are sparse but significant for local history, consisting primarily of rural arteries like Big Porcupine Creek Rd and Johnson Ln, which connect the disparate grazing lands. The map provides a clear look at the township and range system, including t8n r38e and t8n r39e, essential for tracing family land patents and historic property boundaries.