In 1960, the Army Corps of Engineers completed construction of the Painted Rock Dam on the Gila River. Flood waters impounded by the dam periodically inundated approximately of the Gila Bend Indian Reservation. The area lost by the tribe contained a farm and several communities. Residents were relocated to a parcel of land named San Lucy Village, near Gila Bend, Arizona. In January 1986, the enrolled members of the three reservations adopted a new tribal constitution that changed the tribe name from Papago Tribe of Arizona to the Tohono Oʼodham Nation and adopted a three-branch form of government. Also in 1986, the federal government and the Nation approved a settlement in which the Nation agreed to give up its legal claims in exchange for $30,000,000 and the right to add replacement land to its reservation.