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1956 Map of Cajon

Name: 1956 Topographic Map of Cajon
Creator: U.S. Geological Survey
Published: 1969
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1969

About this map

The San Andreas Rift Zone slices diagonally through this mountain landscape, creating the distinct geological corridor of Lone Pine Canyon and Lost Lake. This area serves as a critical transportation artery where the Union Pacific, Southern Pacific, and Atchison Topeka and Santa Fe railroads converge to navigate the steep grades of Cajon Pass. These rail lines weave through the rugged terrain alongside Cajon Creek, passing small settlements and sidings like Alray, Blue Cut, and Keenbrook.

Transitioning from the high desert of Baldy Mesa into the San Bernardino National Forest, the map records early recreation and ranching sites including Glenn Ranch and Little Horsethief Ranch. High peaks such as Cajon Mountain and Sugarpine Mtn overlook a complex network of fire infrastructure, including the Cajon Mountain Lookout and numerous firebreaks. The 1968 revisions, shown in purple, highlight the evolving infrastructure of the interstate corridor as it superseded older routes like the Mojave River Road.