Morongo Valley sits at a geographic transition between the San Bernardino Mountains and the Little San Bernardino Mountains, serving as a high-desert corridor into the Coachella Valley. This 2015 survey documents the modern residential footprint of the area, particularly in Little Morongo Heights and Palm Wells, where a dense network of local roads like Apache Trl and Oskar Ln crisscross the alluvial fans. The landscape is defined by the drainage systems of Big Morongo Cr and Little Morongo Cr, which flow south toward the Big Morongo Wash.
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1901 · Southern California Sheet No. 1
USGS Topo · 1:250,000
1901 · San Jacinto
USGS Topo · 1:125,000
1902 · San Gorgonio
USGS Topo · 1:125,000
1904 · Southern California Sheet No. 1
USGS Topo · 1:250,000
1940 · Palm Springs
USGS Topo · 1:62,500
1941 · Edom
USGS Topo · 1:62,500
1944 · Palm Springs
USGS Topo · 1:62,500
1944 · Edom
USGS Topo · 1:62,500
1947 · Santa Ana
USGS Topo · 1:250,000
1949 · Santa Ana
USGS Topo · 1:250,000