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1959 Map of Las Trampas Ridge

Name: 1959 Topographic Map of Las Trampas Ridge
Creator: U.S. Geological Survey
Published: 1975
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1975

About this map

Las Trampas Ridge and Rocky Ridge dominate the central topography of this 1959 survey, which was photorevised in the early 1970s to show the rapid suburban expansion into the surrounding valleys. The transition from agricultural land to residential developments is visible in the purple-tinted urban extensions around Lafayette, Alamo, and Danville. The map illustrates a complex network of canyons and peaks, including Las Trampas Peak and Ramage Peak, that separate the developing San Ramon Valley from the more secluded Moraga Valley.

Educational and institutional landmarks are prominent, notably the campus of St Marys College and several local schools like Burton Sch and Montair Sch. The southern portion of the sheet is defined by the Upper San Leandro Reservoir and the surrounding Chabot Regional Park, highlighting the early reservation of land for water management and public recreation amid the growing East Bay suburbs. The presence of the Southern Pacific railroad line along the eastern edge underscores the historic transport corridor that facilitated this region's growth.