2024 Map of Donleys Reservoir

About this map

Big Porcupine Creek defines the drainage patterns of this Rosebud County landscape, cutting through a series of pronounced coulees. The map illustrates a contemporary rural Montana environment where significant waterways like Longfork Creek and Living Ash Creek intersect with local land divisions. Transportation in the area relies on a sparse network of gravel and local roads, most notably Big Porcupine Creek Rd, which follows the general path of the primary drainage. The terrain is marked by distinctive geological features such as Larson Coulee, Crossman Coulee, and Machine Coulee, which highlight the erosional patterns common to this part of the state. Small local routes like Johnson Ln provide access to the interior sections of these townships, while Anderson Creek and Horse Creek further delineate the watershed boundaries across multiple township and range lines.