1939 Map of Red Hill

About this map

The Chocolate Mountains dominate this arid landscape, where the ridge of Trip Mtn and the prominent Red Hill rise above an intricate system of desert drainages. This 1930s survey reveals the remote mining and transit routes of southwestern Arizona, centered on the expansive Castle Dome Plain. The map documents early infrastructure such as the Quartzite Yuma Road and the Castle Dome Mine Road, which provided essential access to regional mineral interests. Evidence of local industry is specifically anchored by the Annie Mine in the southern reaches. The intricate network of seasonal watercourses, including Indian Wash, McAllister Wash, and Yuma Wash, illustrates the natural hydrological patterns that travelers and miners had to navigate through the desert floor before more modern developments altered these ancient paths.