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1954 Map of Ontario

Name: 1954 Topographic Map of Ontario
Creator: U.S. Geological Survey
Published: 1963
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1963

About this map

Ontario, Upland, and Pomona anchor this mid-century portrait of the Inland Empire, showing a landscape rapidly transitioning from its citrus-growing roots into a major industrial and transportation hub. The development of the San Bernardino Freeway and the presence of the Ontario International Airport highlight the postwar expansion that redefined the region. Heavy industry is represented by the massive Steel Plant near Kaiser, while the Mira Loma Quartermaster Depot reflects a significant military logistics presence.

Despite the urban growth, the map captures the academic and agricultural legacy of the area, from the Claremont Colleges and Chaffey HS and Jr College to the vineyards of Guasti. To the north, the steep front of the Angeles National Forest rises sharply, capped by peaks like Mt Baldy and Cucamonga Peak, where steep drainages like San Antonio Canyon feed into the emerging water infrastructure of the San Antonio Dam.