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1935 Map of Mt. Gleason

Name: 1935 Topographic Map of Mt. Gleason
Creator: U.S. Geological Survey
Published: 1935
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1935

About this map

Mt Gleason stands as the literal and figurative high point of this 1935 survey, which details a highly vertical landscape within the Angeles National Forest. The map, an advance sheet prepared by the Board of Supervisors of Los Angeles County, reveals a terrain defined by deep drainages like Mill Creek Canyon and the winding course of the North Fork Tujunga Creek. Human presence is sparse, limited to remote sites such as Colby Ranch and Messenger Flats.

A network of high-elevation Firebreak lines follows the ridges, reflecting the early fire management priorities of the era. The presence of water sources like Bear Spring and the Spring near the summit were critical for travelers and forest rangers navigating these heights before modern road development. This survey serves as a precise record of the San Gabriel Mountains prior to mid-century recreational expansion.