1986 Map of Middle Mountains South

About this map

Yuma Proving Ground dominates this arid landscape, highlighting the military significance of the Sonoran Desert in the late twentieth century. The terrain is defined by the sharp rise of the Middle Mountains, where Round Top Peak serves as a prominent natural landmark overlooking the expansive Castle Dome Plain. This desert environment is etched with numerous drainage systems, most notably Dome Wash and Castle Dome Wash, which cut through the alluvial flats. Military infrastructure and resource extraction are evident across the sheet, including an Observation Tower, a network of pipelines, and several Gravel Pits. The presence of numerous Check Dams along the washes indicates active water management and erosion control efforts in this harsh, dry climate during the mid-1980s.