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1955 Map of Jamul Mountains

Name: 1955 Topographic Map of Jamul Mountains
Creator: U.S. Geological Survey
Published: 1973
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1973

About this map

San Miguel Mountain dominates the center of this landscape, anchoring a region of San Diego County caught between established ranchlands and rapid mid-century suburban expansion. To the northwest, the purple-tinted footprints of Spring Valley and Casa de Oro show the growth of residential tracts along the Campo Highway. These modern developments contrast with the older agrarian patterns of the Ivanhoe Ranch and Fenton Ranch, and the isolated presence of The Oaks School in the eastern foothills.

Water management defines much of the terrain, with the Sweetwater Reservoir and Lower Otay Reservoir serving as massive catchments for the Sweetwater River and drainage from the Jamul Mountains. Traces of the area's land grant history remain visible through the boundaries of the Janal Grant Bdy and the Otay (Dominguez) Grant Bdy, marking the transition from Spanish-era grazing lands to the educational and utility infrastructure seen at Southwestern College and the various substations.