
The San Gorgonio Pass serves as a critical corridor through the mountainous terrain of Riverside County, anchoring the growth of Banning and Beaumont during the mid-century. This survey, derived from 1940s road data and military photography, illustrates the heavy reliance on the Southern Pacific railroad and major thoroughfares like Pacific Ave to navigate the gap between the San Jacinto Mountains and the heights of the San Bernardino National Forest.
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This is the sole edition of this map. No revisions or reprints were ever made.
1899 · Redlands
USGS Topo · 1:62,500
1901 · Southern California Sheet No. 1
USGS Topo · 1:250,000
1901 · San Jacinto
USGS Topo · 1:125,000
1901 · Redlands
USGS Topo · 1:62,500
1901 · Elsinore
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
1940 · Hemet Reservoir
USGS Topo · 1:62,500
1942 · Banning
USGS Topo · 1:62,500