Iris Pass serves as a central topographic landmark in this high desert region of Imperial County. The landscape is defined by the Little Chuckwalla Mountains and the winding drainage of Iris Wash, which traverses the terrain from the northwest. Human presence is sparse, represented primarily by the linear utility corridor of Gas Line Rd, which cuts across the western portion of the map. This 2012 survey illustrates the arid character of the area, where natural watercourses and mountain passes dictate the few paths of travel through the southeastern California desert.
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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 · Wister
USGS Topo · 1:24,000