1948 Map of Sonora

About this map

Gold Country mining operations and the growing infrastructure of the Tuolumne River watershed define this late 1940s landscape. The Sierra RR winds through the northern hills, connecting Jamestown and Sonora while passing historic extraction sites like the Harvard Mine and Golden Rule Mine. This era shows the critical role of water management in the Sierra foothills, with the Hetch Hetchy Aqueduct cutting across the terrain near the Don Pedro Reservoir. The map documents numerous family-named landmarks and small community hubs, including Chinese Camp and Jacksonville, alongside remote educational and religious sites like Wards Ferry Sch and Morgan Chapel. From the Red Hills to the depths of the Tuolumne River canyon, the topography reflects a region transitioning from its pioneer mining roots to becoming a vital corridor for California's mid-century water and timber needs.