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1957 Map of San Luis Obispo

Name: 1957 Topographic Map of San Luis Obispo
Creator: U.S. Geological Survey
Published: 1957
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1957

About this map

The Santa Lucia Range dominates this mid-century portrait of the Central Coast, where the Southern Pacific railroad snakes through the mountains to reach San Luis Obispo. At this time, the region is defined by a blend of coastal outposts like Morro Bay and inland agricultural settlements along the Salinas River. Military footprints are significant, with the sprawling Hunter Liggett Military Reservation and Camp Roberts Military Reservation occupying large swaths of the northern interior.

Mineral exploration is marked by the Los Burros Mine and Polar Star Mine in the north, while the landscape further inland transitions into the open Kettleman Plain and Carrizo Plain. Small rural institutions, such as Union School and El Dorado School, provide glimpses into the community fabric of the Cholame Valley and surrounding foothills. The map also documents the coastal geography from Cape San Martin down to the sweeping Estero Bay, capturing the era just as newer infrastructure like Whale Rock Reservoir began appearing on the landscape.