1941 Map of Swarthout

About this map

The San Andreas Rift Zone slices across the landscape of the northern San Gabriel Mountains in this mid-1930s survey. The map reveals a burgeoning recreation and scientific corridor along the Big Pines Highway, featuring the Smithsonian Observatory atop a high ridge and the recreational infrastructure of Big Pines Guard Sta, which includes Tennis Courts and a large Tank. This area, managed as part of the Angeles National Forest, shows a cluster of organized camps and guard stations, such as Camp McClellan and Junior Republic Camp, emphasizing the region's early 20th-century development as a mountain retreat for Los Angeles County.