To direct the Secretary of the Interior to make certain modifications with respect to a water contract with the City of Kingman, Arizona, and for other purposes.

Requires the Secretary of the Interior to: (1) amend a specified water contract between the United States and Kingman, Arizona, dated November 14, 1968, to extend such contract until December 31, 2001; (2) upon request by the city, approve the assignment of the contract from the city to a municipal corporation in Mohave County, Arizona; and (3) after such assignment, amend the contract to make water deliverable under it available for permanent service in a manner that is consistent with a specified plan submitted by the city to the U.S. Bureau of Reclamation on June 29, 1994.

Prohibits the contract from being terminable for nonuse of water before December 31, 2001, and thereafter, only in accordance with the terms of the contract as amended pursuant to this Act.

Grants authorization to join the United States as a party to any suit brought to enforce the Secretary's obligations to perform the provisions of this Act. Waives any claim by the United States to sovereign immunity from such suit.