Is a lake man-made or natural?

Simply speaking, natural lakes are defined as waterbodies without evidence of a dam or where available information indicated the lake was natural even if a dam exists to augment the depth of the lake. Manmade reservoirs are defined as waterbodies that are constructed.



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1. Lake Mead, Nevada. Named after Bureau of Reclamation Commissioner Elwood Mead, Lake Mead is the largest reservoir in the United States, stretching 112 miles long with a total capacity of 28,255,000 acre-feet, a shoreline of 759 miles, and a maximum depth of 532 feet.

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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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The result: Oklahoma has more than 200 manmade lakes. That's more than any other state.

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Top 10 States with the Most Lakes
  • #1: Alaska Lakes (3,000,000) ...
  • #2: Wisconsin Lakes (15,000) ...
  • #3: Minnesota Lakes (11,842) ...
  • #4: Michigan Lakes (11,000) ...
  • #5: Washington Lakes (8,000) ...
  • #6: New York Lakes (7,600) ...
  • #7: Florida Lakes (7,500) ...
  • #8: Texas Lakes (6,700)


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At 1,943 feet (592 meters), Crater Lake is the deepest lake in the United States and one of the deepest in the world. The depths were first explored thoroughly in 1886 by a party from the U.S. Geological Survey.

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Lake Superior holds a massive volume of water because of its enormous inland basin and the hundreds of rivers that feed it.

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How did the Great Lakes get so deep? The Great Lakes are deep due to the heavy glaciers slowly moving north over time. The weight of these glaciers caused the now Great Lakes to become deeper as they moved.

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