The northern reaches of the Chocolate Mountains dominate the southern portion of this landscape, characterized by the intricate drainage patterns of the Colorado Desert. Historical transit routes define the human geography here, most notably the Bradshaw Trl, a vital 19th-century overland stage route that once connected the gold fields of the Colorado River to the coast. This corridor is joined by other utilitarian desert paths, including Summit Rd and Red Canyon Trl, which navigate the complex alluvial fans and washes of the region. Water remains the critical scarce resource of this arid terrain, marked only by the presence of Tabaseca Tank and the seasonal drainage of Salt Cr. The alignment of Gas Line Rd reflects the modern industrial infrastructure that utilizes these traditional transit corridors through the Riverside County interior.
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This is the sole edition of this map. No revisions or reprints were ever made.
1940 · Frink
USGS Topo · 1:62,500
1940 · Iris Pass
USGS Topo · 1:62,500
1940 · Canyon Spring
USGS Topo · 1:62,500
1943 · Canyon Spring
USGS Topo · 1:62,500
1944 · Chuckwalla Mountains
USGS Topo · 1:62,500
1944 · Frink
USGS Topo · 1:62,500
1945 · Iris Pass
USGS Topo · 1:62,500
1954 · Salton Sea
USGS Topo · 1:250,000
1955 · Salton Sea
USGS Topo · 1:250,000
1956 · Frink NW
USGS Topo · 1:24,000