TITLE 43 - US CODE - CHAPTER 15 - APPROPRIATION OF WATERS; RESERVOIR SITES

43 USC 661 - Appropriation of waters on public lands; rights of way for canals and ditches

Whenever, by priority of possession, rights to the use of water for mining, agricultural, manufacturing, or other purposes, have vested and accrued, and the same are recognized and acknowledged by the local customs, laws, and the decisions of courts, the possessors and owners of such vested rights shall be maintained and protected in the same; and the right of way for the construction of ditches and canals for the purposes herein specified is acknowledged and confirmed; but whenever any person, in the construction of any ditch or canal, injures or damages the possession of any settler on the public domain, the party committing such injury or damage shall be liable to the party injured for such injury or damage. All patents granted, or preemption or homesteads allowed, shall be subject to any vested and accrued water rights, or rights to ditches and reservoirs used in connection with such water rights, as may have been acquired under or recognized by this section.

43 USC 662 - Reservation of reservoir sites generally

Sites for reservoirs and other hydraulic works necessary for the storage and utilization of water for irrigation and the prevention of floods and overflows, located or selected prior to August 30, 1890, shall remain segregated and reserved from entry, or settlement, until otherwise provided by law, and reservoir sites thereafter located or selected on public lands shall in like manner be reserved from the date of the location or selection thereof.

43 USC 663 - Restriction of sites to inclusion of necessary lands

Reservoir sites located or selected and to be located and selected shall be restricted to and shall contain only so much land as is actually necessary for the construction and maintenance of reservoirs; excluding so far as practicable lands occupied by actual settlers at the date of the location of said reservoirs.

43 USC 664 - Rights of way over reservoir sites generally

All reservoir sites reserved or to be reserved shall be open to use and occupation under sections 946 to 9491 of this title, and any State is authorized to improve and occupy such reservoir sites to the same extent as an individual or private corporation, under such rules and regulations as the Secretary of the Interior may prescribe: Provided, That the charges for water coming in whole or part from reservoir sites used or occupied under the provisions of this section shall always be subject to the control and regulation of the respective States and Territories in which such reservoirs are in whole or part situate.
[1] See References in Text note below.

43 USC 665 - Rights of way over reservoir sites for wagon road, railroad, or other highway

In the form provided by existing law, the Secretary of the Interior may file and approve surveys and plats of any right of way for a wagon road, railroad, or other highway over and across any reservoir site when in his judgment the public interests will not be injuriously affected thereby.

43 USC 666 - Suits for adjudication of water rights

(a) Joinder of United States as defendant; costs 
Consent is given to join the United States as a defendant in any suit
(1)  for the adjudication of rights to the use of water of a river system or other source, or
(2)  for the administration of such rights, where it appears that the United States is the owner of or is in the process of acquiring water rights by appropriation under State law, by purchase, by exchange, or otherwise, and the United States is a necessary party to such suit. The United States, when a party to any such suit, shall
(1)  be deemed to have waived any right to plead that the State laws are inapplicable or that the United States is not amenable thereto by reason of its sovereignty, and
(2)  shall be subject to the judgments, orders, and decrees of the court having jurisdiction, and may obtain review thereof, in the same manner and to the same extent as a private individual under like circumstances: Provided, That no judgment for costs shall be entered against the United States in any such suit.
(b) Service of summons 
Summons or other process in any such suit shall be served upon the Attorney General or his designated representative.
(c) Joinder in suits involving use of interstate streams by State 
Nothing in this section shall be construed as authorizing the joinder of the United States in any suit or controversy in the Supreme Court of the United States involving the right of States to the use of the water of any interstate stream.