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1942 Map of Chileno Canyon

Name: 1942 Topographic Map of Chileno Canyon
Creator: U.S. Geological Survey
Published: 1942
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1942

About this map

The San Gabriel Mountains dominate this 1942 survey, revealing a landscape defined by critical water management and high-altitude recreation during the early 1940s. The West Fork San Gabriel River flows through the center of the sheet, feeding into a prominent Flood Control Reservoir. This infrastructure represents the massive engineering efforts undertaken to manage the watershed above the Los Angeles basin. In the canyons, the Pasadena Bait Club suggests the area's popularity for local sport, while the Angeles Crest Highway snakes through the northern peaks.

Fire protection and wilderness management are evident through the network of firebreak lines and the Lookout on Pine Mtn. Further south, the high ridge of Monrovia Peak and Spring Camp mark the transition toward the foothills. The map captures a moment when the Angeles National Forest was becoming increasingly accessible for recreation even as its vital role in flood prevention was being solidified through dam and reservoir construction.