National Geographic : 1962 Jul
PAINTING BY PAUL ROCKWOOD,UNDER DIRECTIONOF GEOLOGIST HOWEL WILLIAMS, UNIVERSITY OF CALIFORNIA Deep-blue Crater Lake occupies the cavity created by the loss of Mazama's crown SEVENTEEN cubic miles of the mountain van ished in the cataclysm, leaving a caldera six miles wide and 4,000 feet deep (above). Years passed before the crater cooled. Rain and snow gradually filled the basin to about half its depth. Jagged cliffs imprison the glassy surface, a 20 square-mile mirror (below). Water's depth, 1,932 feet, surpasses that of any other lake in the United States. Even so, its surface lies 500 to 2,000 feet below the caldera's rim.