Fort Lowell was a United States Army post active from 1873 to 1891 on the outskirts of Tucson, Arizona. Fort Lowell was the successor to Camp Lowell, an earlier Army installation. The Army chose a location just south of the confluence of the Tanque Verde and Pantano creeks, at the point where they form the Rillito River, due to the year-round supply of water during that period. The Hohokam natives had chosen the site centuries earlier, presumably for the same reason. To this day, shards of Hohokam pottery can still be found in the area. The Army claimed a military reservation that encompassed approximately eighty square miles and extended east toward the Rincon Mountains.