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1953 Map of Tassajara

Name: 1953 Topographic Map of Tassajara
Creator: U.S. Geological Survey
Published: 1954
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1954

About this map

Morgan Territory and the Black Hills dominate this mid-century topographic study of the divide between Contra Costa and Alameda counties. The landscape is defined by its canyon systems and historic land grants, notably the Las Positas Grant Boundary and the expansive Cañada de los Vaqueros. At this time, the rural character of the region was preserved through a network of winding roads like Morgan Territory Road and Finley Road, connecting isolated springs and small agricultural outposts.

Evidence of earlier rural communities is visible in the presence of the Tassajara Sch (Abandoned) and the Highland Sch (Abandoned), indicating a shift in local population centers by the early 1950s. The small settlement of Tassajara serves as a focal point along Tassajara Road, while various drainages such as Marsh Creek, Sycamore Creek, and Collier Canyon provide a detailed look at the complex local hydrology before modern suburban expansion reached these valleys.