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1955 Map of Mt. Day

Name: 1955 Topographic Map of Mt. Day
Creator: U.S. Geological Survey
Published: 1991
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1991

About this map

Mt Day and the surrounding heights of the Diablo Range define this 1955 survey area, straddling the boundary between Alameda and Santa Clara counties. The landscape is dominated by steep ridgelines like Oak Ridge and Poverty Ridge, separated by deep drainage systems such as Arroyo Hondo and Alameda Creek. This map captures a largely undeveloped wilderness prior to the expansion of regional park systems, though the beginnings of public land management are visible at Camp Ohlone Regional Park and Joseph D. Grant County Park.

Remote outposts like Old Camp and New Camp suggest a history of seasonal ranching or mountain utility, while the presence of the Upper Cherry Flat Reservoir and several named springs, including those at Hamilton Flat, indicate the vital importance of water management in this high-altitude terrain. The network of 4wd tracks provides a detailed look at the limited access points into the interior canyons of Cañada de Pala during the mid-20th century.