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1955 Map of Mt. Boardman

Name: 1955 Topographic Map of Mt. Boardman
Creator: U.S. Geological Survey
Published: 1965
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1965

About this map

Red Mountain and the high ridges of the Diablo Range dominate this mid-century survey at the intersection of Alameda, Santa Clara, San Joaquin, and Stanislaus counties. The landscape is defined by resource extraction and remote infrastructure, notably the Western Mines near Harney School and the Phoenix Mine further east. These sites, coupled with numerous labeled prospects, indicate a period of active geological interest in the mountains.

The presence of the Naval Bombing Range in the southeast corner, complete with an Observation Tower, highlights the area's utility for military training during the 1950s. Water management is evident through various features like Blackbird Spring and Canyon Reservoir, which support the high-altitude Stanislaus County Ranch. The complex drainage network of Del Puerto Canyon and San Antonio Creek illustrates the challenging topography that shaped early ranching and mining access in this corner of the California interior.