Crater Lake in Klamath County, Oregon — The American West (Northwest)
Crater Lake National Park
Eventually, the ice in the valleys melted. When the top of Mt. Mazama caved in about 7,700 years ago, the upper portions of the valleys collapsed with it. Today, you can see the remains of two “U” shaped glacial valleys on the caldera wall across the lake, Kerr Notch (left) an Sun Notch (right).
1. Alternating eruptions of lava and cinders built Mt. Mazama to its maximum height.
2. Glaziers formed on the upper slopes, growing larger during the Ice Age.
3. Climatic changes and more eruptions melted the glaciers, exposing the excavated valleys.
4. The collapse of Mt. Mazama truncated the glacial valleys, leaving “notches” still visible today.
Erected by National Park Service, U.S. Department of the Interior.
Location. Touch for map. Marker is in this post office area: Crater Lake OR 97604, United States of America.
Other nearby markers. At least 4 other markers are within 9 miles of this marker, measured as the crow flies. Stephen Tyng Mather (approx. 0.2 miles away); After the Collapse (approx. ¼ mile away); Before the Collapse (approx. ¼ mile away); Pumice Desert (approx. 8.1 miles away).
Regarding Glacial Valleys. Crater Lake has long attracted the wonder and admiration of people all over the world. Its depth of 1,943 feet (592 meters) makes it the deepest lake in the United States, and the seventh deepest in the world. Its fresh water is some of the clearest found anywhere in the world. The interaction of people with this place is traceable at least as far back as the eruption of Mount Mazama. Founded May 22, 1902, Crater Lake National Park seeks to preserve these natural and cultural resources.
National Park Service
Categories. • Landmarks • Natural Features •
Credits. This page was last revised on June 16, 2016. This page originally submitted on December 23, 2012, by Don Morfe of Baltimore, Md 21234. This page has been viewed 342 times since then and 19 times this year. Photos: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. submitted on December 23, 2012, by Don Morfe of Baltimore, Md 21234. • Syd Whittle was the editor who published this page.
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