At what point is a lake considered dead?

Technically, a dead zone is hypoxic (water with low levels of dissolved oxygen) or anoxic (water that does not contain dissolved oxygen) areas without enough dissolved oxygen to support most aquatic life. Dead zones can form after waters become stratified in the summer and surface and bottom waters do not mix.



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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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Ponds or lakes are divided into 3 categories; they are either Oligotrophic, Mesotrophic, or Eutrophic stages of their life (listed youngest to oldest). Oligotrophic bodies of water are considered new or young ponds or lakes in the overall scheme of things.

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Lake Erie has a lake retention time of 2.6 years, the shortest of all the Great Lakes. The lake's surface area is 9,910 square miles (25,667 km2). Lake Erie's water level fluctuates with the seasons as in the other Great Lakes.

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The good news is that because Lake Erie is so shallow and turns over every 2.6 years, that it can get healthy pretty fast if the problem sources are reduced/eliminated.

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The Gadsar Lake is also called Yemsar which means the lake of Yama and is also referred to as the lake of death.

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The eastern basin, which lies to the east of Erie, Pennsylvania (U.S.), and Long Point, Ontario (Canada), is the deepest and least productive of the three basins. Here, water up to 210 feet deep provides colder conditions for fish that cannot tolerate warm summer temperatures elsewhere in the lake.

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