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Long Valley Caldera, CA

US Forest Service

Long Valley Caldera

During a gigantic eruption about 760,000 years ago, an area bordered by what is now Mammoth Mountain, the Glass Mountains and Crowley Lake (approximately 12 miles wide by 18 miles long), collapsed to ...[more]


The long valley Caldera is the massive, depressed area with Mammoth Lakes to the West, Crowley Lake to the Southeast and the Glass Mountains to the North. helps you discover and book trips to all of America's public places.
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Bureau of Land Management Federal Highway Administration National Oceanic Atmosphere Administration Smithsonian Institution USDA Forest Service US Army Corps of Engineers US Fish and Wildlife Service National Park Service Bureau of Engraving and Printing Tennessee Valley Authority Bureau of Reclamation National Archives Records Administration