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1953 Map of Tassajara

Name: 1953 Topographic Map of Tassajara
Creator: U.S. Geological Survey
Published: 1975
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1975

About this map

Morgan Territory and the Black Hills define the upland geography of this area on the border of Contra Costa and Alameda counties. By the mid-20th century, the landscape remained largely agricultural and sparsely populated, centered around the settlement of Tassajara. The map documents a shift in local education and community structure, noting both the Tassajara Sch and Highland Sch as abandoned facilities.

Water sources are critical to the character of this terrain, with numerous springs dotting the hillsides and feeding into drainages like Alamo Creek, Marsh Creek, and Tassajara Creek. Historical land divisions are visible through the Grant Boundary and the expansive Cañada De Los Vaqueros to the east. A network of rural routes, including Highland Road and Collier Canyon Road, connects the various canyons and valleys that have long shaped the ranching history of the region.