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1986 Map of Trigo Mts

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

USGS Topo · Published 1986

About this map

The Colorado River carves a green path through the arid borderlands of Arizona and California, anchoring a landscape defined by military ranges and massive wildlife sanctuaries in the mid-1980s. Agricultural activity in the Palo Verde Valley near Palo Verde contrasts with the surrounding desert, where the Yuma Proving Ground and the Chocolate Mountain Aerial Gunnery Range dominate the terrain. Along the river's meandering course, specialized riverside sites like Paymaster Landing and Walters Camp provided access points for river travelers and local commerce.

Prospecting history is visible throughout the mountains, with numerous workings like the Castle Dome Mine and Opal Hill Mine scattered across the Trigo Mountains and Castle Dome Mountains. These sites, alongside landmarks like the Geode Beds, reflect a long-standing interest in the mineral wealth of the desert. Extensive conservation areas, including the Cibola National Wildlife Refuge and Kofa National Wildlife Refuge, protect the unique ecology of the desert washes and river lagoons.