Wizard Island was created after
Mount Mazama, a large
complex volcano, erupted violently approximately 7,700 years ago, forming its
caldera which now contains Crater Lake. Following the cataclysmic caldera-forming eruption, which left a hole about deep where the mountain had once stood, a series of smaller eruptions over the next several hundred years formed several cinder cones on the caldera floor. The highest of these cones, the only one to rise above the current lake level, is Wizard Island, which rises over above the lowest point on the caldera floor and the deepest point in the lake. Another large cinder cone, Merriam Cone, is in the northeast part of the lake. Although Merriam Cone rises about above the caldera floor, its summit is still below the average lake level. Its surface features and lack of a crater indicate that Merriam Cone formed under water. == Access ==