When was the last time Lake Tahoe erupted?

Mount Pluto is an extinct volcano in the Granite Chief Range near Lake Tahoe, California. The volcano erupted approximately 2 million years ago producing lava and mudflows that dammed Lake Tahoe. The Northstar California ski resort covers part of the 8,617-foot-high (2,626 m) peak.



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Lake Tahoe, with its massive 744,600-acre foot storage capacity, should come very close to filling. (The top 6.1 ft. of storage above the lake's rim is used to provide river flows and drought reserves). This is a remarkable rebound for the lake which, in early December, was almost six inches below its natural rim.

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If Lake Tahoe was completely drained, it would cover a flat area the size of California to a depth of 14 inches, but would take over 700 years to refill. Lake Tahoe is, geologically, a “young lake” having been formed 10,000 to 11,000 years ago.

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Is Lake Tahoe man-made? A. The formation of Lake Tahoe occured naturally over the course of 3-4 million years through faulting, volcanic activity, and glaciation. However, as a result of the dam (controlled by the federal water master) located in Tahoe City, the Lake is also a reservoir.

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Here's an oft-asked question: Can you swim in Lake Tahoe? The answer is yes, especially if cool/cold water is your thing! And, if you look at all the water sports outfitters and popular beaches in the area, it's clear that it's absolutely a preferred thing to do in Tahoe for a lot of people.

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Lake Tahoe is over 2-3 million years old. Tahoe is considered an ancient lake and is counted among the 20 oldest lakes in the world.

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So far, their discoveries include a diamond ring, possible ship wreckage, and over 25,000 pounds of trash. However, Fallen Leaf Lake, about one-mile southwest of Tahoe, contains an ancient underwater forest with 80-foot tall trees from 2,000 years ago.

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Because of that 2 million year old routing, a very very deep lake was created in the basin. Lake Tahoe is 1,645 feet deep (compared to a height of 1,454 for the Empire State Building). The depth means that, despite the chill, the lake never completely freezes.

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Nestled in the Sierra Nevada and straddling the California/Nevada border, Lake Tahoe is the second deepest lake in the United States after Crater Lake, Oregon. Lake Tahoe is the fourth deepest lake in North America and the sixteenth deepest lake in the world. The maximum depth of Lake Tahoe is 1,644.1 feet.

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Despite the copious amounts of snow and persistent cold, Lake Tahoe remains sparkling blue and largely free of any ice cover, with the exception of marinas along the shore. Experts say it won't freeze this year and likely never has in human memory. That's because Lake Tahoe is deep — very deep.

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Several thousand years ago according to Dr. Richard Schweickert, a retired professor of geology at the University of Nevada, Reno who has spent most of his career working in the Sierra Nevada, Tahoe had a tsunami.

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These faults are among the most significant seismic sources in the region and have their most active portions in the lake. In addition to ground shaking and surface ruptures from earthquakes, the exceptional depth of Lake Tahoe creates the additional hazard of tsunamis.

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Tahoe Tessie is the name given to the legendary creature that is said to inhabit Lake Tahoe. Similar to the Loch Ness Monster of Scotland, Tahoe Tessie is said to be a giant, prehistoric creature with a long neck and a serpentine body.

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The water in Lake Tahoe is of excellent quality, and our community treatment plants are designed to remove or inactivate microorganisms, meeting exacting standards .

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Lake Tahoe has some of the purest drinking water in the world. That's because 65% of the lake's water comes from small tributaries and 315 miles of watershed – the other 35% falls straight into the lake as rainfall. Combine that with a high elevation, and it's no wonder why Lake Tahoe is so pure.

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Why is the Lake so blue? Tahoe's clean air and water are the keys to the Lake's dazzling blue color. The surface of Lake Tahoe is blue in part because it's reflecting the sky, but there is more to this phenomenon. Water as crystal clear as Tahoe's absorbs red light, leaving the rich blue color that we all see.

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