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1947 Map of Las Trampas Ridge

Name: 1947 Topographic Map of Las Trampas Ridge
Creator: U.S. Geological Survey
Published: 1956
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1956

About this map

St Marys College and the winding course of the Southern Pacific railroad anchor this mid-century survey of the hills and canyons between the San Ramon Valley and the East Bay. The landscape is defined by the sharp elevations of Las Trampas Ridge and Rocky Ridge, which separate the burgeoning small towns of Alamo and Danville from the protected waters of the Upper San Leandro Reservoir.

Insights into early 20th-century life appear in the rural pockets, such as the Edenvale School (Abandoned) in the southern canyon lands and the scattered homesteads of Burton. The map documents a moment before suburban expansion fully transformed the ranch lands, showing the original extent of the Arroyo De Las Nueces Y Bolbones land grant and the complex network of creeks, including Bollinger Creek and Las Trampas Creek, that carved these valleys.