The selling of leases and oil royalties have changed over the years. The Aneth Extension was created from Public Domain lands as part a 1933 exchange for lands flooded by Lake Powell. Congress appointed Utah as trustee on behalf of Navajos living in San Juan County, Utah for any potential revenues that came from natural resources in the area. Utah initially created a 3-person committee to make leases, receive royalties and improve the living conditions for Utah Navajos. As the revenues and resulting expenditures increased, Utah created the 12 member Navajo Commission to do the operational work. The Navajo Nation and Bureau of Indian Affairs are also involved.