1933 Map of Glendora

About this map

Morris Reservoir and the adjacent San Gabriel Mountains dominate this 1933 survey, which captures a critical moment of engineering expansion in Los Angeles County. This advance sheet highlights the Morris Dam and the Big Dalton Dam, infrastructure designed to manage water flow and storage for the growing communities below the foothills. The landscape is a network of ridges and canyons, where resources and access are marked by the Kelsey Mine and a series of rugged paths like the Garcia Trail and Woods Trail. Within the Angeles National Forest, the presence of numerous Firebreak lines and scattered Spring labels indicates the constant management of this dry, fire-prone terrain. The map also includes a small portion of the San Dimas Foot Hill Park, showing the early 20th-century transition of these slopes from wild lands to managed recreational and utility zones.