1978 Map of Thornton

About this map

The Mokelumne River and its intricate network of sloughs and channels dominate this landscape at the boundary of Sacramento and San Joaquin counties. Centered on the town of Thornton, the area is defined by massive agricultural land divisions like the New Hope Tract, Canal Ranch, and Brack Tract. These tracts, often protected by siphons and aqueducts, demonstrate the intensive water management required for the region's farming and resource extraction, including the Walnut Grove Gas Field.