Arizona v. California was a 12-year epic battle including three years of trial in front of a special master appointed by the U.S. Supreme Court. Proceedings at the U.S. Supreme Court required two oral arguments, producing a 5-3 decision in 1963 with two dissenting opinions, with the majority opinion implemented by a decree in 1964. The case was an original action in the U.S. Supreme Court, with Arizona seeking to clarify its rights to the use of Colorado River basin water. In addition to Arizona and California, Nevada, New Mexico, and Utah were party to the case because they had lands located within the Lower Basin. The United States was also party to the case because of the federal water projects and lands located within the Lower Basin. It was perhaps the most high profile water case ever to be decided by the U.S. Supreme Court and produced considerable commentary.
The Arizona v. California Collection contains more than 160 full-text, searchable pleadings, briefs, orders, transcripts, and reports from the 12-year original proceedings in the U.S. Supreme Court. The case culminated in a June 3, 1963 decision, reported in Arizona v. California , 373 U.S. 546 , which was implemented by a March 9, 1964 decree, reported in Arizona v. California , 376 U.S. 340. Both documents are contained in the collection along with 106 witness testimonies, many volumes of exhibits and a 433-page final report submitted the Supreme Court-appointed special master for the case.