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1955 Map of Mt. Day

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

USGS Topo · Published 1972

About this map

The Diablo Range terrain of the Alameda and Santa Clara county line is defined by the steep watersheds of Arroyo Honda and Isabel Creek. This 1955 survey, updated with 1971 aerial data, captures the remote character of Camp Ohlone Regional Park and the high points of Mt Day and Black Mtn. The landscape is a network of ridges and flats, featuring Poverty Ridge and the broad Cañada de Pala.

Remote encampments such as Old Camp and New Camp are connected by a series of primitive Jeep Trails, illustrating the limited access to these highlands mid-century. Significant water features include the Upper Cherry Flat Reservoir and the drainage of Valpe Creek. The map provides a detailed view of the Alameda Co Santa Clara Co border as it crosses Mt Lewis, offering a clear picture of the historical land divisions and topographical landmarks of the East Bay interior.