Crater Lake National Park
P.O. Box 7
Crater Lake, OR 97604-0007
Phone: 541-594-2211
Crater Lake lies within the caldera of Mt. Mazama, a volcano of the Cascade Range that erupted about 7,700 years ago. The mountain collapsed, forming a caldera. Its greatest depth of 1,932 feet makes it the deepest lake in the United States