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Mt. Mazama’s eruption left ash across eight states and three Canadian provinces. 5,000 square miles were covered with six inches of Mazama’s ash. In the park’s pumice desert ash lies 50 feet deep.
The deep blue water of Crater Lake is due to the lake’s depth. Light is absorbed, color by color, as it passes through clear water. First the reds are absorbed, followed by orange, yellow and green. The last to be absorbed is blue. Only the deepest blue, from sunlight, gets scattered back to the surface of the lake.
Snow plows do not usually finish their work until mid June. Visitors come to the park from June through October. But travelers should check the park’s web site, even in June or September, to ensure they can visit the lake.
Colorful pumice lies undisturbed among scorched boulders inside the crater and blankets the ground throughout the pumice desert (high desert) that surrounds Crater Lake.
The lake was formed after the collapse of an ancient volcano, posthumously named Mount Mazama. This volcano violently erupted approximately 7,700 years ago. That eruption was 42 times as powerful as the 1980 eruption of Mt. St. Helens. The basin or caldera was formed after the top 5,000 feet of the volcano collapsed. Subsequent lava flows sealed the bottom, allowing the caldera to fill with approximately 4.6 trillion gallons of water from rainfall and snow melt, to create the seventh deepest lake in the world
