1955 Map of Mt. Day

About this map

Mt Day and the surrounding high country of the Diablo Range are documented here in the mid-1950s, capturing a landscape defined by steep drainages and remote encampments. The terrain is marked by significant elevations like Black Mtn and Mt Lewis, where the border between Alameda County and Santa Clara County follows the high ridgelines. Water systems are central to the geography, with Arroyo Honda and Alameda Creek carving deep paths through the hills, while the Cherry Flat Reservoir sits in the southwest corner. The map reveals the era's sparse human footprint, showing Old Camp and New Camp connected only by a network of primitive tracks, including the Reservoir Road and various unnamed jeep trails. Names like Van Horn Flats and Rattlesnake Butte reflect the local character of this upland territory before modern development reached these higher elevations.