Why Lake Tahoe is clearer than it has been in 40 years?

The research team says the lake's native zooplankton, which recently surged in population, is responsible for the change. The microscopic animal helps keep the lake clear by eating tiny particles that make the water cloudy.



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Now, researchers report that Tahoe is the clearest it's been in 40 years—and it's thanks to tiny zooplankton that gobble up the particles that make the water cloudy.

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Lake Tahoe does not get its iconic blue tint because the water is so clear. Instead, the lake's blueness comes from the amount of algae in the water. Lake Tahoe is one of the most pure bodies of water in the world with 99.994% of the water pure. Commercially distilled water is 99.998% pure.)

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Tahoe's clean air and water are the keys to the Lake's dazzling cobalt 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 and reflects the rich blue color that we all see.

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Clarity is measured as the depth to which a 10-inch white disk, called a Secchi disk, remains visible when lowered into the water. In 2022, Lake Tahoe's average annual clarity was 71.7 feet compared to 61 feet in 2021.

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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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Now, researchers report that Tahoe is the clearest it's been in 40 years—and it's thanks to tiny zooplankton that gobble up the particles that make the water cloudy.

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In 2022, Lake Tahoe reached its highest water clarity point since the 1980s. That's according to a report published on Monday by the University of California, Davis Tahoe Environmental Research Center (TERC), which has been tracking water clarity and many other aspects of the lake since the 1960s.

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Lake Tahoe is a popular summer destination thanks to its beaches and a popular winter vacation spot thanks to its slopes. Lake Tahoe is a popular summer destination thanks to its beaches and a popular winter vacation spot thanks to its slopes.

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Uncovered and exposed: Secrets of pristine Lake Tahoe
  • There is a nude beach (and you can drink on the beach legally)
  • Most of the ski terrain is hidden in the backcountry.
  • There's a better way to access Tahoe's amazing historic sites.
  • A Frank Sinatra overdose helped put Tahoe on the map.
  • Tahoe isn't the only lake in town.


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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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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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Lake Tahoe Stretching all the way down to 1,645 feet deep, Lake Tahoe has beautiful crystal-clear waters at an elevation of 6,225 feet above sea level. Known for its phenomenal clarity, this ancient lake has the purest waters in North America, making this The Clearest Lake in the United States.

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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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Compared to other lakes, Tahoe's cast of aquatic characters is fairly small. Among those you can see with the naked eye, there are several species of trout (rainbow, brook, brown and lake), the Kokanee salmon, crayfish, mysis shrimp, and a few other near-shore and bottom-dwelling fish.

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Many beaches circle all areas of Lake Tahoe and you can swim in many of them. Some of our favorites are Kings Beach on the north shore, Sand Harbor on the east shore, Ed Z' Burg State Park on the west, and Zephyr Cove and Meeks Bay on the south side.

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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, 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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Get trusted guidance to the world's most breathtaking experiences delivered to your inbox weekly with our email newsletter. Tahoe is one of the deepest lakes in the world, and one of the oldest, at 2 million years old, per the Lake Tahoe Tourism Board.

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