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1955 Map of Mt. Boardman

Name: 1955 Topographic Map of Mt. Boardman
Creator: U.S. Geological Survey
Published: 1972
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1972

About this map

Mt Boardman and Mt Mocho anchor a landscape defined by sharp elevation changes and deeply cut canyons along the junction of San Joaquin, Stanislaus, Santa Clara, and Alameda counties. The mapping reflects a rugged terrain where early industrial and educational infrastructure survived into the mid-20th century. Magnesite and manganese extraction is evident at the Western Mines near Red Mountain Creek, while the presence of the Harney School on Sweetwater Road suggests a once-active rural community in these remote uplands.

A distinct military presence occupies the southeastern quadrant of the sheet with the Naval Bombing Range, set apart from the ranching operations at the Stanislaus County Ranch. Hydrological features like Blackbird Spring and Passionate Spring dot the canyons, feeding into major drainages such as Puerto Canyon and the San Antonio Valley. This survey captures the transition of the Diablo Range from a site of active mining to one of varied government and agricultural land use.