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1949 Map of Black Star Canyon

Name: 1949 Topographic Map of Black Star Canyon
Creator: U.S. Geological Survey
Published: 1955
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1955

About this map

Irvine Lake and the surrounding Santa Ana Mountains dominate this mid-century topographic record, showing a landscape defined by water management and mineral extraction. The reservoir is held by the Santiago Dam, which was vital for the citrus-rich plains of Orange County during this era. The map captures the industrial heritage of the canyons, noting several inactive sites like the Santiago Coal Mine and Black Star Coal Mine, as well as the Claymont Clay Mine near Gypsum Canyon.

Transitioning from the foothills of the Lomas de Santiago toward the higher peaks of the Cleveland National Forest, the terrain rises toward Sierra Peak. This survey documents the early footprint of the Main Divide Motorway and the isolated settlement at Hidden Ranch. Along the northern edge, the Santa Ana River flows through the canyon, providing a crucial corridor for the inland-reaching Atchison Topeka and Santa Fe Railway.