Why are the Great Lakes losing water?

Evaporation draws water from the lakes causing levels to decline. Evaporation is greatest when the temperature difference between the water and the air is greatest. Such conditions occur in the fall, when the air has cooled but the water still retains some of the heat gained during the summer.



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Climate change can have an array of impacts on lakes. The most obvious, Yao said, is to increase evaporation. As lakes shrink, this can also contribute to an “aridification” of the surrounding watershed, the study found, which in turn increases evaporation and accelerates their decline.

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In winter, the precipitation amounts decline in the colder air. A loss of water level basically comes down to more water flowing out and evaporating than falling as precipitation.

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The water that replenishes the Great Lakes comes from precipitation, which is driven by the region's climate.

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Threats to the Great Lakes' ecosystems, include invasive species, climate change, pollution, and habitat destruction. Climate change affects water temperatures, weather patterns, and lake levels.

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Those findings are consistent with a study from Michigan Technological University. That study found Lake Superior is expected to rise on average by 7.5 inches while levels on the Lake Michigan-Huron system is projected to increase 17 inches by 2050 due to climate change.

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According to the average of their simulation ensemble, by 2040–2049, the average annual water levels of Lake Superior, Michigan-Huron, and Erie are projected to increase by 0.19, 0.44, and 0.28 m, respectively, relative to 2010–2019 under the Representative Concentration Pathway (RCP) 8.5 scenario.

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Threats & Conservation The source of toxic pollutants includes decades of industrial waste, raw sewage overflows, runoff from cities, and mining operations. Excess nutrients that throw the ecosystem out of balance enter the lakes from agricultural runoff and untreated sewage.

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Current pressures on the Lake Michigan ecosystem include increasing use of groundwater by a growing basin population, disruption of the aquatic food web, and habitat alteration.

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While our growing zone might be reduced to a shorter No. 3 without the lake, our overall temperatures might increase, say the experts. “Spring and summer would definitely be warmer without the lake, but winters would be considerably colder,” says Dan.

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The outflows of Lake Superior and Lake Ontario are controlled to keep the lake levels within a specific range, near their long-term averages. Levels of Lake Superior have been regulated since 1921. Levels of Lake Ontario have been regulated since 1958.

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The Great lakes are fed by rivers which get their water from rain or melting snow, neither is salty. The lakes then ultimately drain into the St. Lawrence River then the Atlantic Ocean. The water drained away is replenished by precipitation which does not contain salt.

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During the 1960s, Lake Erie was declared a “dead lake” due to eutrophication and pollution. The children's book, The Lorax, written by Dr. Seuss, actually included the following line referring to fish: “They will walk on their fins and get woefully weary in search of some water that isn't so smeary.

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Of all of the Great Lakes, Lake Erie had become predominantly polluted by the 1960s, largely due to the heavy industrial presence along its shores. With 11.6 million people living in its basin, and with big cities and sprawling farmland dominating its watershed, Lake Erie is severely impacted by human activities.

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About 80 percent of the U.S. Great Lakes shoreline is privately owned and not accessible to the public. In contrast, just 20 percent of the Canadian Great Lakes shoreline is in private hands. The Great Lakes are considered by many to be the economic engine of the Midwest region.

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Everything You Need to Know About the Lake Mead Drought Water levels have been steadily declining since 2000, leading to the current drought of the popular Lake Mead. In June of 2022, Lake Mead faced a unique situation. Many people were trying to access the lake beyond the usual holiday crowds.

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