Is 5 acres a pond or lake?

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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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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Based upon their thermal stratification, lakes are classified as either holomictic, with a uniform temperature and density from top to bottom at a given time of year, or meromictic, with layers of water of different temperature and density that do not intermix.

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Lakes are classified based on productivity, or how much photosynthesis is occurring in the water.
  • Oligotrophic lakes have low levels of productivity, these are often clearer water.
  • Mesotrophic lakes have a middle level of productivity. ...
  • Eutrophic lakes are high in productivity, so high they can be green in color.


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Most lakes are named after a feature. A sandy lake is often named Sandy Lake. A lake with a lot of fish is often named Fish Lake. A lot of lakes are repeats; there are 20 Mud Lakes in Minnesota.

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