1940 Map of Mt. Baden-Powell

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The San Andreas Rift Zone slices through the northern reaches of this high-elevation terrain, creating a distinct geological trough that shapes the local hydrology and landscape. This 1930s-era survey reveals an area of the San Gabriel Mountains defined by significant peaks and deep drainage systems like Vincent Gulch and Iron Fork. High above the canyons, Mt Baden-Powell and Throop Peak dominate the skyline, while human activity is centered on recreation and industry. The presence of the Big Horn Mine on the slopes of Baden-Powell indicates the mineral interests of the period, while established sites like the Boy Scout Camp, Girl Scout Camp, and Camp Manzanita highlight the region's importance as a mountain retreat for Los Angeles County residents.