Colorado River Basin Ten Tribes Partnership Tribal Water Study

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Agreement Regarding the Importance of the Colorado River Basin Tribal Water Study

Colorado River Basin Water Supply and Demand Study

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In 2014, The Bureau of Reclamation’s Upper Colorado Region and Lower Colorado Region, in collaboration with the 10 member tribes of the Colorado River Basin Tribes Partnership, commonly referred to as the Ten Tribes Partnership (Partnership), began the Colorado River Basin Ten Tribes Partnership Tribal Water Study (Tribal Water Study) to build on the technical foundation of the Colorado River Basin Water Supply and Demand Study (Basin Study) and advance critical information about the member tribes beyond the limited assessment of tribal water in the Basin Study.

The tribes of the Partnership hold a significant amount of quantified and unquantified federal reserved water rights to the Colorado River and its tributaries. In addition, there are unresolved reserved water rights claims and some tribes hold water rights that are not federal reserved water rights. Reclamation did not intend that the Basin Study be used to assess the future impacts of tribal water use in the Basin, and the Basin Study did not fully account for tribal water demand, reflect the potential use of tribal water presently used by others, or show the potential impact on the Basin water supply if a substantial amount of the presently unused or unquantified tribal water is used by the tribal water rights holders by 2060. In recognition of the importance in bringing the tribal perspective to bear in furthering the understanding of these important matters, Reclamation and the Partnership committed to developing and completing the Tribal Water Study as documented in the Agreement Regarding the Importance of the Colorado River Basin Tribal Water Study.

Member tribes of the Ten Tribes Partnership are the Chemehuevi Indian Tribe, Cocopah Indian Tribe, Colorado River Indian Tribes, Fort Mojave Indian Tribe, Jicarilla Apache Nation, Navajo Nation, Quechan Indian Tribe, Southern Ute Indian Tribe, Ute Indian Tribe of the Uintah and Ouray Reservation, and the Ute Mountain Ute Tribe.

Last Updated: 12/14/16