How big is a pond 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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It may surprise you to know there is no technical difference between lakes and ponds, according to the National Park Service(Opens in a new window). However, a general rule of a thumb is if a body of water is large and deep it's a lake and if it's short and shallow it's a pond.

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There is no absolute definition between the two. The one used most often is the 5-acre rule: Ponds are less than 5 acres while lakes are more than 5 acres. Since most ponds across the country are less than an acre, we will use the term pond for the sake of this blog post.

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In the U.S. a pond is defined as a body of water with a surface area of less than ten acres (40,000 square metres). By that definition, a puddle could be classed as a pond. On the other side of the 'Big Pond' (aka the Atlantic Ocean), in some parts of England, a pond is only called a pond if it is man-made.

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A typical lake has three distinct zones (limnetic, littoral and the benthic zone; Fig. 11) of biological communities linked to its physical structure.

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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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