The Chocolate Mountains dominate this arid landscape, showing the complex topography of the high desert along the border of Riverside and Imperial counties. The terrain is defined by steep ridges and deep washes that drain toward the Salton Sink. At the southern edge of the survey, the Coachella Canal provides a stark linear contrast to the natural relief, marking the edge of the desert's agricultural potential. The map's detail reveals the intersection of these dry mountain ranges with the critical water infrastructure that transformed this region of California. The lack of settlements or roads on this sheet underscores the isolation of the range within the public land survey system, specifically throughout townships t8s r13e, t8s r14e, and t9s r13e.
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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