
Joshua Tree National Park spans the southern portion of this landscape, where the high peaks of the Coxcomb Mountains rise sharply from the desert floor. This area of the Mojave Desert is defined by its vast alluvial plains and the critical infrastructure of the Colorado River Aqueduct, which cuts a straight line across the Cadiz Valley before entering the mountains near the West Iron Portal. The map illustrates the convergence of San Bernardino and Riverside counties, capturing the transition from the broad, sandy reaches of the Palen Valley to the rugged granite ridges that form a natural boundary. The engineering required to transport water through such arid terrain is evident in the aqueduct's precise path, which bypasses the natural contours of the desert flats to reach its mountain transit point.
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This is the sole edition of this map. No revisions or reprints were ever made.
1942 · Amboy
USGS Topo · 1:250,000
1943 · Amboy
USGS Topo · 1:250,000
1943 · Cadiz Valley
USGS Topo · 1:62,500
1943 · Iron Mountains
USGS Topo · 1:62,500
1943 · Coxcomb Mountains
USGS Topo · 1:62,500
1944 · Coxcomb Mountains
USGS Topo · 1:62,500
1952 · Palen Mountains
USGS Topo · 1:62,500
1954 · Salton Sea
USGS Topo · 1:250,000
1954 · Needles
USGS Topo · 1:250,000
1955 · Salton Sea
USGS Topo · 1:250,000