2017 Map of Blackstone Reservoir

About this map

Blackstone Reservoir sits at the heart of this high-desert landscape in southwestern Idaho, serving as a critical water source in a region defined by its arid plateaus. The surrounding terrain is marked by seasonal drainages such as Louise Cr and Sheep Cr, which carve through the open range. The area is largely defined by public land divisions, as seen in the grid of townships T11S and T12S, reflecting the administrative heritage of the Owyhee backcountry. Notable geographic depressions like Big Holes and the winding Juniper Draw punctuate the topography near the reservoir. The presence of the Blackstone Grasmere Rd indicates the primary transit corridor through the Blackstone Desert, connecting this isolated rangeland to the broader region. This 2017 survey captures the intersection of cattle-ranching geography and modern hydrological management in a sparsely populated section of the state.