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1939 Map of Borrego

Name: 1939 Topographic Map of Borrego
Creator: U.S. Geological Survey
Published: 1956
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1956

About this map

Anza Desert State Park and Borrego State Park dominate this 1939 aerial survey, revealing the early infrastructure of the San Diego backcountry. The landscape is defined by the convergence of steep ranges like the Vallecito Mountains and the Pinyon Mountains with broad, arid basins such as Earthquake Valley. The presence of the Overland Stage Route trailing through Blair Valley provides a clear link to the region's mid-19th-century transit history, showing the path taken by travelers long before modern highways.

Early desert development is visible at Borrego Springs and the Borrego Desert Lodge, while isolated outposts like Las Arena Ranch and Yaqui Well denote critical water stops in the dry terrain. The map captures the intricate drainage patterns of San Felipe Creek and Coyote Creek as they move toward the Borrego Sink, illustrating the geological transition from high granite peaks to the desert floor.