Why is Lake Erie a dead zone?

Dead Zones This stratification of lake water is due to the different densities of water with temperature change. The bacterial activity increases as dead algae and other materials settle to the bottom of the lake. Since the hypolimnion is much smaller than the upper layers, the oxygen can be depleted during the summer.



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The cause of the algae blooms Lake Erie's algae blooms are caused by runoff pollution. This type of pollution occurs when rainfall washes fertilizer and manure spread on large farm fields into streams that flow into Lake Erie.

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Although small in volume, Lake Erie is a thriving, productive environment. It has survived challenges brought about by pollution, over-fishing, eutrophication, invasive species and harmful algal blooms.

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The water is drinkable and the amount of toxic chemicals has declined. “There's good news, but it is coupled with the sobering reality that we have significant problems that linger,” said Brian Smith, associate executive director of Citizens Campaign for the Environment.

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Lake Erie occupies a basin that was carved out of Earth's crust over millions of years by rivers and glaciers. The oldest rocks from which the basin was carved are about 400 million years old and formed in a tropical ocean reef environment.

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Because of the phosphorus reductions, our Lake became much more clear and clean. Fish flourished and Lake Erie became known as the “Walleye Capital of the World.” Tourists once again flocked to Lake Erie. Lake Erie became the greatest ecosystem recovery in the world.

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Middle Stage of Early Lake Erie. Based on Herdendorf, 2013. Blue is full extent of the prehistoric lake with light blue for those waters of Lake Huron over the modern lake area. About 10,000 YBP the water levels began to level off.

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