Q:

Is Lake Tahoe manmade?

A:

Quick Answer

Lake Tahoe is not manmade but was formed by two major faults that caused the landscape to rise and fall. High peaks resulted from the “up thrown” blocks, and a deep valley was created by the “down thrown” fault blocks.

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Full Answer

After the volcanic and faulting period, an Ice Age followed, which caused huge glaciers to move down the canyons, scouring loose rock away and reshaping the V-shaped canyons into U-shaped valleys. As the glaciers melted, they left behind jagged peaks, brilliant bays and crystal-clear lakes.

Lava that flowed from Mt. Pluto formed a dam across the ancestral outlet of the Basin forming the Truckee River. Streams from snowfall flowed into the Basin, which created a lake hundreds of feet higher than the present Lake Tahoe.

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