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2015 Map of La Costa Valley

Name: 2015 Topographic Map of La Costa Valley
Creator: U.S. Geological Survey
Published: 2015
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2015

About this map

San Antonio Reservoir serves as a central landmark in this landscape, where the transport of water and energy defines the modern geography of Alameda County. The convergence of the Hetch Hetchy Aqueduct and the S Bay Aqueduct highlights the region's critical role in California's infrastructure. In the northwestern corner, the small settlement at Scotts Corner sits near the entrance to Vallecitos Valley, a corridor marked by the Vallecitos Atomic Laboratory Rd.

South of the reservoir, the terrain rises into the Diablo Range, featuring prominent heights like Maguire Peaks and the long expanse of Apperson Ridge. The map details a complex network of canyons and gulches, including Coal Mine Canyon, which points to the area's geological and extractive history. Streams like Alameda Cr and Arroyo Valle wind through these valleys, illustrating the natural drainage patterns that have shaped local ranching and land use across La Costa Valley.