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1954 Map of Ontario

Name: 1954 Topographic Map of Ontario
Creator: U.S. Geological Survey
Published: 1959
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1959

About this map

The Angeles National Forest and San Bernardino National Forest dominate the northern landscape of this mid-1950s survey, where the peak of Mt Baldy rises above canyons like San Antonio Canyon and Cucamonga Creek. Below the mountain line, the expanding suburban and industrial grid of the Pomona Valley is clearly visible. The map records the significant educational footprint of the Claremont Associated Colleges and Chaffey HS and Jr College, alongside the critical aviation infrastructure of the Ontario International Airport and the California Air National Guard base.

A dense network of railroads, including the Atchison Topeka and Santa Fe and the Southern Pacific, serves the region's industry, most notably a large Steel Plant in the east. Settlements like Guasti, Alta Loma, and Etiwanda are shown before the full integration of these distinct communities into the modern urban corridor. The presence of the Mira Loma Quartermaster Depot reflects the lingering military logistics of the post-war era.