Altar Valley defines the arid character of this Pima County landscape, where an intricate network of desert drainages converges toward the Altar Wash. The terrain is marked by a complex system of seasonal watercourses, including the Fresno Wash, Sabino Wash, and Chiltepines Wash, which illustrate the natural irrigation patterns of the high desert. Significant topographical features like Sabino Canyon and Cerro Prieto Wash break the valley floor, while man-made water catchments such as Pozo Nuevo Tank, Espinosa Tank, and Pozo Hondo Tank reflect the critical infrastructure required for ranching and livestock in this environment. The sparse human footprint is limited to major corridors like Az-286 and local ranching tracks, including S Espinosa Ranch Rd, highlighting the persistence of traditional land use in this southwestern borderlands region.
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1920 · Arivaca
USGS Topo · 1:125,000
1940 · Palo Alto Ranch
USGS Topo · 1:62,500
1941 · Presumido Peak
USGS Topo · 1:62,500
1941 · Baboquivari Peak
USGS Topo · 1:62,500
1941 · Arivaca
USGS Topo · 1:62,500
1943 · Fresnal
USGS Topo · 1:125,000
1943 · Arivaca
USGS Topo · 1:62,500
1943 · Palo Alto Ranch
USGS Topo · 1:62,500
1943 · Presumido Peak
USGS Topo · 1:62,500
1944 · Baboquivari Peak
USGS Topo · 1:62,500