1990 Map of Bryan Mountains

About this map

Bryan Mountains dominate the eastern landscape of this 1990 provisional survey, providing a sharp topographic contrast to the broad desert floor. Most of the terrain is governed by federal land management, split between the Barry M Goldwater Air Force Range and the Cabeza Prieta Wilderness and National Wildlife Refuge. The map illustrates the sparse, arid geography of the Mohawk Valley and San Cristobal Valley, where the lack of developed infrastructure and permanent settlements reflects the area's role as a restricted military and conservation corridor. The boundary between Township 12 South and Township 13 South bisects the quadrangle, which serves as a specialized record of land use and desert hydrology in the final decade of the 20th century.