Butterfield Pass is the central topographical landmark in this southwestern Maricopa County landscape, where the desert floor is defined by a dense network of intermittent drainage channels. The small settlement of Estrella sits at the southern edge of the quadrangle, serving as a rare point of human habitation in a region characterized by its hydrological features. Water management in this arid environment is reflected in the placement of Conley Tank, a vital resource for livestock or wildlife in a territory otherwise marked by seasonal washes. A single paved artery, S Bullard Ave, enters from the northeast, providing one of the few formal connections to the broader Phoenix metropolitan fringe. The geography here is a study in desert drainage patterns, showing how the landscape funnels runoff through the pass toward the plains below.
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1951 · Estrella
USGS Topo · 1:62,500
1951 · Gila Bend
USGS Topo · 1:62,500
1951 · Mobile
USGS Topo · 1:62,500
1951 · Cotton Center
USGS Topo · 1:62,500
1953 · Ajo
USGS Topo · 1:250,000
1954 · Phoenix
USGS Topo · 1:250,000
1957 · Ajo
USGS Topo · 1:250,000
1957 · Phoenix
USGS Topo · 1:250,000
1958 · Ajo
USGS Topo · 1:250,000
1958 · Phoenix
USGS Topo · 1:250,000