The big water projects in the San Juan River basin were mostly built by the U.S. Bureau of Reclamation after the 1950s as participating units of the Colorado River Storage Project, whose aim is to regulate the water supply of the upper Colorado River system, control floods and generate power. Navajo Dam, completed in 1963 after five years of construction, impounds 1.7 million acre feet (2.1 km3) of water in Navajo Lake. The dam serves for flood control, irrigation and long-term water storage, and its operations are paired with two major water projects of the upper San Juan River: the San Juan-Chama Project which diverts almost per year from the San Juan watershed to the Rio Grande system serving Albuquerque, New Mexico, and the Navajo Indian Irrigation Project which provides water for of farmland on the Navajo Nation. These two projects together were designed to put to "beneficial use" the water allocated to New Mexico under the 1922 Colorado River Compact, which divided the waters of the Colorado River and its tributaries between the seven U.S. states that make up the Colorado River Basin.