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1939 Map of Azusa

Name: 1939 Topographic Map of Azusa
Creator: U.S. Geological Survey
Published: 1939
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1939

About this map

The San Gabriel Mountains rise sharply above the expanding citrus belts and residential grids of the eastern Los Angeles Basin in this late 1930s survey. Specialized health and recreational sites occupy the transition between town and timber, including the Sanatorium and the Canyon Tuberculosis Preventatorium near Bradbury, alongside the South Pasadena Veterans Camp tucked into the foothills. The San Gabriel River and numerous washes like Sawpit Wash define the local topography, while the San Bernardino Base Line provides a key survey anchor for the region.

Transportation networks are well-established, showing the Pacific Electric and Southern Pacific railroads serving the citrus-growing communities of Monrovia, Duarte, and Azusa. Significant engineering works are visible, such as the Metropolitan Aqueduct traversing the steep canyons and the network of firebreaks protecting the San Gabriel National Forest from the ever-present threat of wildfire in the chaparral.