Big Tank
Reservoir in Graham County, Arizona · on the USGS Greasewood Mountain quadrangle
32.45452, -109.78761
Maps that show Big Tank
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Greasewood Mountain, AZ
USGS topo, 2026
Willcox, AZ
USGS historical 15-minute topo (1943)
Willcox, AZ
USGS historical 15-minute topo (1958)
Safford Ranger District Motor Vehicle Use Map (MVUM)
Coronado National Forest
IFR Enroute Low Altitude Chart L-05 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-04 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).