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CHAPTER I 19 <br />Although the Urban Agencies opposed redetermination of irrigable acreages within the undisputed Reser- <br />vation boundaries; i.e., the "omitted" lands, they believed it timely to determine the Reservation boundary <br />issues, including those of the Three Tribes. <br />However, the Urban Agencies repeated the arguments of the States Response to the effect that the <br />Secretarial orders as to boundary changes were not binding for the purpose of establishing a claim for a <br />Federally reserved water right which would impinge on MWD's water rights, and that this argument applied <br />to similar claims of the Three Tribes as well. They also maintained that res judicata barred all claims for "omit- <br />ted" lands as that issue had been fully tried in Arizona v. California. <br />The Urban Agencies did not oppose permissive intervention of the Two Tribes solely for the purpose of <br />litigating additional water rights based on alleged expansion of Indian Reservation boundaries, nor the similar <br />claims of the Three Tribes, and requested the appointment of a Special Master to adjudicate all these bou da, <br />ary disputes under Articles II(D) (5) and IX of the 1964 Decree. However, as did California, <br />Coachella Valley County Water District and Imperial Irrigation District, they attached conditions thereto. The <br />proposed supplemental nde ee ndentcounsel that the United States not be allowed concurrently to Tribes <br />epresent <br />lowed to intervene with independent <br />the Tribes as trustee. <br />K. 7 Supreme Court Nearing and Supplemental Decree <br />On October 10, 1978, the Supreme Court heard oral arguments from the various parties to the aforesaid <br />Motions, Petitions and Responses. On January 9, 1979, in a Per Curiam Opinion, the Court ordered <br />l that the <br />Joint Motion of the United States, Arizona, the California D fenda t decree which was the a Supt l e Article <br />decree (filed May 30, 1978) is granted, and entered the supplemental <br />VI of the 1964- Decree and of negotiation and argument since that time. <br />The Court appointed Judge EIbert P. Tuttle as Special Master with authority to fix the time and conditions <br />for the filing of additional pleadings and to direct subsequent proceedings. <br />The Court denied the motion of the Fort Mohave Indian Tribe, et al. , for leave to intervene to oppose entry <br />to the supplemental decree, and referred this motion in all other aspects and the motion of the Colorado <br />River Indian Tribes, ef al.., to. the Special Master. <br />A copy of -the supplemental. decree appears in Appendix 1005 <br />K.8 New Phase of Decreed Rights .. <br />Even before the Supreme Court had resolved the Article VI PPRs by its supplemental decree of January 9, <br />1979, the United States on December 21, 1978, filed a Motion for Modification of the Decree (of March 9, <br />1964) and Supporting Memorandum. The motion sought to permit additional diversions of mainstream <br />water for the five Reservations. <br />The reasons therefore were: <br />(1) The boundaries of the Reservations "have been finally determined..." <br />(2) The boundary adjustments, effected since the Decree of March 9, 1964, have confirmed additionally <br />practicably irrigable lands for which the United States reserved water rights, as follows: <br />Fort Mohave Reservation <br />Chemehuevi Reservation <br />Colorado River Reservation <br />Fort Yuma Reservation <br />Cocopah Reservation <br />3,000 acres in California <br />150 acres in California <br />3,110 acres in California <br />4,200 acres in California <br />1,300 acres in Arizona <br />1,112 acres in Arizona <br />(3) There are within the boundaries of the Reservations practicably irrigable lands which, in approximate <br />erroneously omitted from consi and are entitled to reserved water rights: <br />