1958 Map of Sleepy Valley

About this map

San Andreas Rift Zone geology defines the northern landscape of this late 1950s survey, where Leona Valley follows the tectonic trough beneath Portal Ridge. The map captures a transition from the agricultural and ranching activity in the north to the protected high country of the Angeles National Forest. Distinctive family holdings and small settlements like Ritter Ranch, Los Robles Ranch, and Lincoln Crest are tucked into the canyons, while the Sierra Pelona Lookout stands as a sentinel over the southern peaks.