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2020 Map of Donleys Reservoir

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

USGS Topo · Published 2020

About this map

Donleys Reservoir sits as a central water feature in this portion of Rosebud County, where the landscape is defined by an intricate network of drainage basins and coulees. The map illustrates the varied topography through named depressions such as Larson Coulee, Machine Coulee, and Crossman Coulee, which channel seasonal runoff toward larger systems like Big Porcupine Cr.

Remote road access is limited to thoroughfares like Big Porcupine Creek Rd and the smaller Johnson Ln, reflecting the sparsely settled nature of this grazing and agricultural territory. The confluence of several local waterways, including Longfork Cr and Living Ash Cr, reveals the natural plumbing of the Montana plains before they reach Horse Cr to the south. This survey provides a clear look at the township and range boundaries that continue to organize land ownership in the region.