2011 Map of Gap Tank

About this map

Aguirre Valley dominates this arid landscape in the Schuk Toak District of Pima County, serving as a broad drainage basin for the surrounding highlands. The desert floor is defined by a complex network of ephemeral waterways, most notably the braided courses of El Tiro Wash, Mammoth Wash, and Aguirre Wash, which illustrate the natural hydrological patterns of the Sonoran region. In the northern reaches, the West Silver Bell Mountains provide significant relief against the alluvial plains. This 2011 survey by the U.S. Geological Survey documents a largely undeveloped landscape where water management is critical, evidenced by the presence of Gap Tank, a localized water source that likely serves as a vital point for cattle or local wildlife in an otherwise dry environment.