1916 Map of Bachelor Valley

About this map

Bachelor Valley and the expansive historical tracts of the Thompson Rancho and Rancheria Del Rio Estanislao define this central California landscape at the time of the 1913 field survey. The map reveals a rural topography organized around the Mt Diablo Base Line, which serves as a primary surveying datum for the region. Education was decentralized in this era, as evidenced by the distribution of the Black Hill School, Bachelor Valley School, and Rosedale School across the drainage basins of Rock Creek and Hoods Creek. Industrial activity is represented by the Quail Hill Mine in the northeast, while the small settlement of Eugene sits near the crossing of Littlejohns Creek, illustrating the early 20th-century transition from land-grant ranchos to established rural communities.