1949 Map of Las Trampas Ridge

About this map

St Marys College and the surrounding hills of the Laguna de los Palos Colorados land grant dominate the northwestern portion of this mid-century survey. The landscape transitions from the residential and agricultural pockets of the San Ramon Valley, where Alamo and Danville are situated along the Southern Pacific railroad line, to the steep, undeveloped terrain of Las Trampas Ridge. Significant water resources are represented by the sprawling Upper San Leandro Reservoir in the southwest, into which numerous drainages like Kaiser Creek and Cull Creek flow. Insights into the area's rural transition are visible in features like the Edenvale School (Abandoned) in the southeast and the various unnamed prospects located along Alamo Ridge. The map captures the East Bay before the period of massive post-war suburban expansion, showing a topography still defined by its creeks, canyons, and peaks like Las Trampas Peak.