How big does a pond have to be before it becomes a lake?

The Definition of Lakes and Why There's No Standardization A pond is a body of water less than 0.5 acres (150 square meters) in an area or less than 20 feet (6 meters) in depth. A lake is defined as a body of water bigger than 1 acre (4,000 m²), although size is not a reliable indicator of its water quality.



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For a lake to keep its water over time, it has to be replenished. There are both natural and man-made lakes. The main way that water gets into reservoirs and man-made lakes is from the rivers and streams that were dammed to create them.

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Depth should vary from 3 to 12 feet, with an average of 6 to 8 feet. Less than 3 feet of water allows sunlight to reach the bottom of the lake, thus promoting aquatic weed growth, which will limit fish size. In the South, 12 feet of water will protect fish during the winter months.

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Benthic Zone. The Benthic Zone is the bottom of the pond or lake and consists of organic sediments and soil. As the body of water ages, this zone will increase. It is considered the pond or lake's digestive system.

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