84 STAT. ]
PUBLIC LAW 91-409-SEPT. 25, 1970
861
Public Law 91-409 AN ACT
September 25, 1970
To reauthorize the Riverton extension unit, Missouri River Basin project, to include therein the entire Riverton Federal reclamation project, and for other purposes.
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Be it enacted by the Senate and House of Representatives of the Missouri River United States of America in Congress assemhJed^ That the general Basin project. plan for the Riverton extension unit, Missouri River Basin project, "R7verto"nV>Jheretofore authorized under section 9 of the Flood Control Act of 'g^^jhorr^ition 1944 (58 Stat. 887), is modified to include relief to water users, con- '^^" °"^^ '""* struotion, betterment of works, land rehabilitation, water conservation, fish and wildlife conservation and development, flood control, and silt control on the entire Riverton Federal reclamation project. A s so modified the general plan is reauthorized under the designation "Riverton unit of the Missouri River Basin project". The Riverton extension unit shall be operated in such manner that identifiable return flows of water will not cause the Wind River to be in violation of water quality standards promulgated pursuant to the Water Quality Act of 33 USC 466 1965 (79 Stat. 903). note. SEC. 2. (a) The Secretary of the Interior is authorized to negotiate ""Amendatory reand execute an amendatory repayment contract with the Midvale payment contract Irrigation District covering all lands of the Riverton unit. This contract shall replace all existing repayment contracts between the Midvale Irrigation District and the United States. (b) The period for repayment of the construction and rehabilitation Repayment and betterment costs allocated to irrigation and assigned to be repaid P^"°'^by the irrigation water users shall be fifty years from and including the year in which such amendatory repayment contract is executed. (c) During the period required to construct and test the adequacy of drains and other water conservation works, the rates of charge to land classes and the acreage assessable in each land class in the unit shall continue to be as established in the amendatory repayment contract with the district dated June 26, 1952; thereafter such rates of charge and assessable acreage shall be in accordance with the amortization capacity and classification of unit lands as determined by the Secretary. SEC. 3. (a) Construction and rehabilitation and betterment costs of unproductive the Riverton unit which the Secretary determines to be assignable to lands classified now or hereafter as permanently unproductive shall be nonreturnable and nonreimbursable: Provided, That whenever new lands or lands now or hereafter classified as nonproductive, are classified or reclassified as productive, the repayment obligation of the district shall be increased appropriately. (b) All miscellaneous net revenues of the Riverton unit shall accrue to the United States and shall be applied against irrigation costs not assigned to be repaid by irrigation water users. (c) Construction and rehabilitation and betterment costs of the Riverton unit allocated to irrigation and not assigned to be repaid by irrigation water users nor returned from miscellaneous net revenues of the unit shall be returnable from net revenues of the Missouri River Basin project within fifty years from and including the year in which the amendatory contract authorized by this Act is executed. SEC. 4. The limitation of lands held in beneficial ownership within a^uTtion^!,^ the unit by any one owner, which are eligible to receive project water from, through, or by means of project works, shall be one hundred and sixty acres of class 1 land or the equivalent thereof in other land classes, as determined by the Secretary.
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