Is Lake Tahoe an extinct volcano?

The Lake Tahoe area is not currently considered to be volcanically active (it must have had an eruption in the last 10,000 years to meet that criteria). However, if magma were to return to the area, future eruptions and new lava dams would pose a flooding hazard both around the Lake Tahoe basin and beyond.



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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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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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One reason is that 40 percent of the precipitation falling into the Lake Tahoe Basin falls directly upon the Lake. Much of the remaining precipitation drains through marshes and meadows, which are an effective filtration system that remove fine particles before water enters the Lake.

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The Lake owes it extraordinary natural clarity mainly to its exceptional depth and volume, a relatively small watershed and favorable climatological conditions. In 2013, clarity averaged 70.1 feet, far less than the maximum 105 feet of clarity measured in 1968.

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Some scientists and water experts say that if the dry spell continues, the lake could reach record low levels not seen since measurement of the lake started, more than 120 years ago. If that happens, Fannette Island, located in Emerald Bay, could become separate from the main lake.

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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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Lake Tahoe is not only a natural wonder, it's an American treasure. It's hard to imagine a lake more captivating.

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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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First of all, Lake Tahoe's only natural outlet, the Truckee River, carries water into Nevada, not California, where it terminates at Pyramid Lake. This means there are no legal water rights to use Tahoe water in California, aside from a few local uses along the river's path to Nevada.

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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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The lake owes its clearness to a lack of fine particulates, while the blue color is caused by lack of algae. The lake, which has grown even bluer over the past few years, actually grew murkier over the second half of the 20th century but still retained its blue color.

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