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1958 Map of Green Valley

Name: 1958 Topographic Map of Green Valley
Creator: U.S. Geological Survey
Published: 1975
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1975

About this map

Green Valley serves as the primary settlement in this mountainous reach of Los Angeles County, situated amidst a landscape defined by water management and resource extraction during the late 1950s. The northern portion of the Sierra Pelona range is dominated by the Bouquet Reservoir and its associated engineering works, including the Bouquet Canyon Dam and an extensive Los Angeles City Aqueduct Tunnel system. These infrastructure projects, punctuated by features like the Aqueduct Surge Tank and San Francisquito Powerhouse No 2, illustrate the region's critical role in the urban water supply network.

Historical mining activity is evidenced by the California Mine near Jupiter Mountain and the Silver King Mine to the southeast. The backcountry is accessible via a network of firebreaks and truck trails, supporting several recreational sites such as South Portal Campground and Bouquet Campground No 4. This survey, later updated with photorevisions in the mid-1970s, captures the interface between industrial utility and the remote canyons of the San Francisquito Canyon corridor.