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1939 Map of Glendora

Name: 1939 Topographic Map of Glendora
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 dominate the northern landscape of this 1930s survey, rising sharply above the citrus groves and expanding settlements of the San Gabriel Valley. The massive San Gabriel Reservoir, held by the Morris Dam, serves as a critical hydrological anchor for the region. Below the mountains, the communities of Glendora and San Dimas are clearly defined by their street grids and the intersecting routes of the Pacific Electric and Atchison Topeka and Santa Fe railroads.

Institutional growth is evident through a high concentration of private academies and schools, such as the Carlin Military Academy, Sierra Military Academy, and the Girls Collegiate Sch. The transition from the rugged canyons like Big Dalton Canyon to the residential areas near South Hills illustrates the mid-century development pattern as infrastructure like the Aqueduct and major thoroughfares such as Foothill Boulevard began to reshape the valley floor.