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1959 Map of Pacifico Mountain

Name: 1959 Topographic Map of Pacifico Mountain
Creator: U.S. Geological Survey
Published: 1975
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1975

About this map

Pacifico Mountain stands as a central topographic anchor in this high-altitude portion of the Angeles National Forest, where the landscape is defined by the steep descent into Santiago Canyon and Aliso Canyon. The 1959 data, with updates from 1974, captures a specialized mountain economy of isolated ranches and infrastructure. Long-standing local holdings like Niles Ranch, Montgomery Ranch, and Wagonwheel Ranch dot the canyons, while the presence of the Gold Queen Mine near Mill Creek Summit points to the area's mineral prospects.

Transport and utility corridors are clearly marked, showing the Southern Pacific railroad and Angeles Forest Highway skirting the northwest corner through Soledad Pass. This area serves as a vital watershed for the desert below, centered on the Little Rock Reservoir and the Little Rock-Palmdale Dam. The map also details numerous fire management features, including a complex network of firebreaks and the Roundtop Truck Road, essential for protecting these forested ridges.