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1939 Map of Palomar Mountain

Name: 1939 Topographic Map of Palomar Mountain
Creator: U.S. Geological Survey
Published: 1962
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1962

About this map

The Observatory stands as a focal point atop Palomar Mountain, overlooking a landscape defined by significant tribal lands and national forest territory. This survey detail reveals the spatial relationship between the Mission Indian Reserve, Pauma Indian Res, and the Rincon Indian Reservation along the San Luis Rey River. These reservations sit adjacent to the dense slopes of the Cleveland National Forest, where steep canyons like Nigger Canyon and high points such as Boucher Hill dominate the topography.

Lower elevations show the early 20th-century infrastructure of the Aguanga Valley and Oakgrove Valley, including the Stage Sta and Cottonwood Sch. The map tracks a network of rugged routes like the Usardt Truck Trail and the Radec Trail, which connected remote outposts like Sawyer Spring and Grammer Ranch to the broader region before the expansion of modern highway systems. At the southeastern corner, the waters of Lake Henshaw collect at the edge of Love Valley.