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1993 Map of Las Trampas Ridge

Name: 1993 Topographic Map of Las Trampas Ridge
Creator: U.S. Geological Survey
Published: 1997
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1997

About this map

St Marys College and the surrounding valley communities define this East Bay landscape as it transitioned into the late 20th century. The map illustrates a period of significant suburban infill within the San Ramon Valley and Moraga Valley, where residential footprints in Lafayette, Alamo, and Danville press against the undeveloped slopes of Las Trampas Ridge. This geography creates a sharp contrast between the dense street grids of Moraga and the preserved open spaces to the south and west.

The southern portion of the sheet is dominated by the watershed of the Upper San Leandro Reservoir and the extensive grounds of Anthony Chabot Regional Park. Local landmarks such as Las Trampas Peak and Ramage Peak provide high-ground perspective over the winding canyon roads like Bollinger Canyon Road. This documentation captures the area's balance between municipal growth and the preservation of large-scale natural features and public arboretums.