2014 Map of Twelvemile Reservoir

About this map

Grindstone Rim and Walker Ridge dominate this high-desert landscape in central Oregon, where the terrain is defined by dramatic volcanic features and essential water management. The boundary between Crook County and Harney County runs through the eastern portion of the map, intersecting the path of Twelvemile Creek. This arid environment relies on several man-made and natural water sources, including the centrally located Twelve Mile Reservoir and the more isolated Lillard Reservoir to the south. Land use is largely determined by these scarce water points and the elevation changes of landmarks like Three Buttes and Coffee Butte. Significant drainages such as Norcross Creek and Black Snag Creek carve through the ridges, while remote tracks like Old Berger Road provide the only established access through this sparsely inhabited segment of the high country.