CAPPAERT v. UNITED STATES, 426 U.S. 128 (1976) - 1976 Supreme Court decision affirming the Ninth Circuit that as of 1952 when the United States reserved Devil's Hole, it acquired by reservation water rights in unappropriated appurtenant water sufficient to maintain the level of the underground pool to preserve its scientific (426 U.S. 128, 129) value and thereby implement the Presidential Proclamation.