What happens when a lake becomes stagnant?

Algae are tiny plants that multiply rapidly when the water becomes stagnant. Some types of algae produce toxins that can be harmful to both humans and animals. Moreover, these algae can form dense layers that block sunlight from reaching the bottom of the water.



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After several thousand more years, your lake will continue become shallower in the center, more shoreline will erode into the water, trees will fall in, leaves, dust and dirt will blow in, weeds will become thicker and grow out farther into the lake, die, decay and add to the bottom.

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Lakes lifespans are limited, as rivers dump their sediment into them and dead plant material builds up on the lake bottom. Most lakes are less than 10,000 years old.

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