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Lake Stratification and Mixing:

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Many of our Illinois lakes and reservoirs are deep enough to stratify, or form "layers" of water with different temperatures. Such thermal stratification occurs because of the large differences in density (weight) between warm and cold waters.

Density depends on temperature: water is most dense (heaviest) at about 39EF, and less dense (lighter) at temperatures warmer and colder than 39F.

	Lake Stratification and Mixing (PDF printable version, 97KB)
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