2024 Map of Sandpiper Reservoir

About this map

Upper Missouri River Breaks National Monument defines the southern half of this landscape, where the Missouri River drainage carves deep into the Montana plains. The topography is dominated by an intricate network of coulees, including the winding Bullwhacker Coulee and Coal Mine Coulee, reflecting a rugged erosion pattern characteristic of the breaks. Local water management is evident through a series of small uplands impoundments such as Sandpiper Reservoir, Blanch Reservoir, and Bud Reservoir, which serve this arid ranching country. Transportation is limited to primitive routes like the Cow Island Trl and Bullwhacker Rd, tracing high ridges between the drainages. These trails follow historical corridors used for moving livestock and supplies through the broken terrain above the Missouri River valley.