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1986 Map of Trigo Pass

Name: 1986 Topographic Map of Trigo Pass
Creator: U.S. Geological Survey
Published: 1986
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1986

About this map

The Yuma Proving Ground dominates this mid-1980s landscape, illustrating the restricted military presence that has shaped this portion of the Arizona desert. The terrain is defined by the Dome Rock Mountains and the South Trigo Peaks, where natural corridors like Trigo Pass, Weaver Pass, and Felipe Pass provide the only practical routes through the sharp relief.

Evidence of early exploration is sparse but present through a Mine Shaft and various Prospect labels, indicating mineral interest in the crags. Drainage patterns are clearly marked by the ephemeral Tyson Wash, Ehrenberg Wash, and Trigo Wash, which channel seasonal waters from the heights across the desert floor. The boundary between La Paz and Yuma Counties bisects the region, marking a jurisdictional shift in this arid wilderness during the late twentieth century.