UNITED STATES DEPARTMENT OF THE INTERIOR Office of the Secretary Washington 25, D. C. June 12, 1963 Dear Governor: The Supreme Court's decision in Arizona v. California on June 3 marked the beginning of a new phase in water development in the States of the lower Colorado River basin. While the Court's final decree remains to be formulated, the basic issues have now been decided. The people of the Pacific Southwest are now confronted with their greatest conservation challenge. It requires the development of a plan to meet the water needs of that region which is at once the driest and the fastest growing in the United States. In a real sense the Court's decision is only a shifting of shortages. It leaves us the pressing problem of providi...