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1920 Map of Pacheco Pass

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

USGS Topo · Published 1920

About this map

Pacheco Pass serves as the primary gateway through the Diablo Range, connecting the coastal mountains to the broad San Joaquin Valley. This 1920 edition documents the early infrastructure of the region, including the Pacheco Pass Road winding through the hills and the industrial presence of the Shell Pumping Sta. The landscape is defined by its transition from high summits like Crevison Peak and Hagerman Peak down to the alluvial plains where early educational and community hubs like Occidental School, Cottonwood School, and the Cottonwood Church were established.

Local ranching and resource extraction are evident through the identification of the San Luis Ranch, Howard Ranch, and the Bald Eagle Mine. The intricate drainage system of the eastern Diablo Range is meticulously charted, featuring Orestimba Creek, Quinto Creek, and Mustang Creek. These waterways and gulches provided the vital structure for early settlement and transport before modern hydraulic changes significantly altered the valley's character.