Are the Great Lakes drying up?

Water levels in the Great Lakes have fluctuated since 1860. Over the last few decades, water levels have declined slightly for most of the Great Lakes (see Figure 1). The past few years, however, have shown notable increases toward the top of the historical range.



People Also Ask

Water levels in the Great Lakes have fluctuated since 1860. Over the last few decades, water levels have declined slightly for most of the Great Lakes (see Figure 1).

MORE DETAILS

Climate change's hotter temperatures and society's diversion of water have been shrinking the world's lakes by trillions of litres of water a year since the early 1990s. A close examination of nearly 2,000 of the world's largest lakes found they are losing about 21.5 trillion litres a year.

MORE DETAILS

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.

MORE DETAILS

The Great Lakes are struggling under the combined weight of many ailments, from invasive species and toxic chemicals to the nutrient runoffs that fuel Lake Erie's chronic algae problem. And in many cases, climate change is making it worse.

MORE DETAILS

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.

MORE DETAILS

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

MORE DETAILS

Pollution from over a century of intensive development remains in the sediment of many Great Lakes tributaries, harming fish and wildlife and leaving water unsafe for people. These sites are being cleaned up through the Great Lakes Legacy Act by the U.S. EPA in partnership with local, state, and private organizations.

MORE DETAILS

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.

MORE DETAILS

The net volume loss in natural lakes is largely attributable to climate warming, increasing evaporative demand, and human water consumption, whereas sedimentation dominates storage losses in reservoirs.

MORE DETAILS

No. People are not capable of changing things on that scale. We could easily pollute the water and make it undrinkable, but we can't drain the lakes, because there is just too much water there, and it's constantly refilled from too many sources, including rain and snow melt.

MORE DETAILS

The average underwater visibility of Lake Superior is about 8 metres or 27 feet, making it the cleanest and clearest of the Great Lakes.

MORE DETAILS

Drinking Water - State of the Great Lakes. The 2012 Great Lakes Water Quality Agreement states that “the Waters of the Great Lakes should be a source of safe, high quality drinking water”. Approximately 8.5 million Canadians and 19.5 million Americans get their drinking water from the surface waters of the Great Lakes.

MORE DETAILS

Lake Erie drains into Lake Ontario via the Niagara River. The entire system flows to the Atlantic Ocean via the St. Lawrence River. As it flows from its westernmost point in Duluth, Minnesota to the Atlantic Ocean, the waterway drops in elevation approximately 600 feet.

MORE DETAILS

Lake sturgeons are the biggest fish in the Great Lakes. And while individuals can pass the century mark, the species has been around since the days of the dinosaurs.

MORE DETAILS

The Great Lakes are freshwater ecosystems. Traditionally, Lake Michigan, for example, has been a very low-salt lake, with levels around one milligram of chloride per liter of water. Over the years, due to our increased salt use, that level has steadily but gradually climbed up to 15 milligrams per liter.

MORE DETAILS

Climatic conditions control precipitation (and thus groundwater recharge), runoff, and direct supply to the lakes as well as the rate of evaporation. These are the primary driving factors in determining water levels.

MORE DETAILS