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1954 Map of Ontario

Name: 1954 Topographic Map of Ontario
Creator: U.S. Geological Survey
Published: 1962
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1962

About this map

The Santa Ana del Chino land grant and the foothills of the Angeles National Forest define the landscape of the Pomona Valley in the mid-1950s. This survey captures a transitional era as citrus groves and agriculture began to yield to post-war industrial and residential expansion. Significant landmarks include the expansive Steel Plant in Kaiser and the Mira Loma Quartermaster Depot, reflecting the region's importance to defense and manufacturing.

Education and infrastructure are central to this map, featuring the Claremont Associated Colleges, Upland College, and Chaffey HS and Jr College. Transportation networks are heavily represented by the Southern Pacific and Atchison Topeka and Santa Fe railroads, alongside the developing Ontario International Airport. From the northern peaks like Cucamonga Peak to the southern boundaries of Chino, the map documents the early growth of modern Ontario and its neighboring communities.