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1920 Map of Pacheco Pass

Name: 1920 Topographic Map of Pacheco Pass
Creator: U.S. Geological Survey
Published: 1938
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1938

About this map

San Luis Gonzaga terrain dominates this 1920 survey of the rugged divide between the Central Valley and the coastal ranges. The eastern edge of the map reveals a burgeoning agricultural landscape in the Joaquin Valley, where the Old Canal and the Joaquin River supported early irrigation. Vital infrastructure of the era is visible at the Shell Pumping Sta, while the primary transit artery, the Pacheco Pass Road, snakes through the mountains toward the coast.

Genealogists and local historians can locate several family-held landmarks such as the San Luis Ranch, Howard Ranch, and Fifield Ranch. The map also preserves the locations of early rural civic life at the Occidental School, Cottonwood School, and Cottonwood Church. Higher in the Diablo Range, the Bald Eagle Mine and peaks like Crevison Peak and Hagerman Peak mark a landscape defined by ranching and mineral exploration before modern development altered the terrain.