2014 Map of East Pass

About this map

East Pass serves as a distinct corridor through the volcanic landscape of the Crater Range, providing a natural transit point in this arid stretch of the Sonoran Desert. To the south, the Growler Mountains and Childs Mountain flank the broad expanse of Childs Valley, a region defined by its drainage patterns and extreme isolation. The map illustrates the hydrological importance of ephemeral systems like Tenmile Wash and Daniels Arroyo, which cut through the terrain to shape the local geography. This 2014 survey documents the boundary between Maricopa Co and Pima Co, capturing the township and range divisions that structure this sparsely settled borderland. The area's character is defined by its massive basaltic formations and dry alluvial plains, offering a detailed look at the geomorphology of Southwestern Arizona.