1943 Map of Mt. Diablo

About this map

Mt Diablo and its surrounding peaks dominate this 1943 landscape, providing a detailed look at Contra Costa County during the early war years. The area is defined by a series of significant canyons and valleys, including Marsh Creek and Amador Valley, which shaped the early road networks like Kirker Pass Road. Local education and social centers are well-documented through rural schoolhouses such as Morgan Territory Sch, Liberty Sch, and Tassajara Sch, many of which served dispersed ranching families. The Southern Pacific railroad corridor tracks through the western and northern edges, connecting the industrial settlement of Cowell and the agricultural hub of Danville. This survey, revised using 1937 aerial photography from the 91st Observation Squadron, captures the transition from cattle ranching at Blackhawk Ranch to the early development of San Ramon and Clayton.