1955 Map of Mount San Antonio

About this map

Mount San Antonio towers over this section of the eastern San Gabriel Mountains, a landscape defined by the tectonic activity of the San Andreas Rift Zone which cuts through Swarthout Valley in the north. The 1955 survey, updated with 1980s data, details a network of high-altitude mining and recreation sites. Prospecting history is etched into the terrain at the Big Horn Mine and Native Son Mine, while the mountain's southern slopes are home to established outposts like Manker Flat and Camp San Antonio. The intersection of heavy resource extraction and early alpine leisure is evident, with the Prairie Fork Guard Sta monitoring remote reaches of the Angeles National Forest and the Sheep Mountain Wilderness. Settlement concentrated at Wrightwood contrasts with the isolated camps and ranches, such as Widman Ranch and Weber Camp, that once served those traversing the canyons.