1942 Map of Ontario and Vicinity

About this map

Ontario and Upland stand as the central hubs of this 1942 edition survey, which illustrates the organized grid of citrus groves and vineyards that defined the San Bernardino Valley before mid-century suburbanization. The landscape is bisected by a sophisticated transit network, including the Atchison Topeka And Santa Fe, Southern Pacific, and Union Pacific railroads, alongside the Pacific Electric line. From the base of the San Gabriel Mountains at San Antonio Heights, the terrain slopes southward past College Hill and the Bellevue Cem toward the agrarian settlement of Chino. Local landmarks such as the Sierra Vista Sch and the community of Narod are clearly positioned within the extensive land grants of Cucamonga and Santa Ana Del Chino. The map captures the region's hydraulic reliance on the San Antonio Wash and Cucamonga Wash, which channeled seasonal runoff across the developing alluvial plain.