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1941 Map of Alder Creek

Name: 1941 Topographic Map of Alder Creek
Creator: U.S. Geological Survey
Published: 1948
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1948

About this map

Mining and mountain ranching define this mid-century landscape within the Angeles National Forest. Isolated operations like the Falcon Mine and Monte Cristo Mine are visible along the steep drainages of the San Gabriel Mountains, highlighting the region's historical extractive industry. The high-altitude terrain is marked by prominent peaks such as Pacifico Mtn and Granite Mtn, with Loomis Ranch providing a rare human settlement in the rugged interior north of the North Fork Middle Fork.

Transportation through these heights is anchored by the Angeles Crest Highway, supported by a State Highway Maintenance Sta and the Chilao Guard Station. Water sources, essential for both mining and the scattered ranching outposts, are meticulously documented, from the perennial flow of Alder Creek to isolated spots like Fountainhead Spring. The transition from early 1930s topography to late 1940s cultural revisions illustrates the established infrastructure of the national forest during this period.