1940 Map of Trail Canyon

About this map

The San Gabriel Mountains dominate this 1940 edition, showing the high-elevation backcountry of the Angeles National Forest just before mid-century. Steep-walled drainages like South Fork Pacoima Canyon and Bear Canyon define the landscape, where water sources such as Yerba Buena Spring and the Big Cienega were critical waypoints for early forest travel. The map details a network of ridges and deep ravines, including Gold Canyon and Slaughter Canyon, anchored by prominent summits like Condor Peak and Iron Mtn.