Why is Lake Erie so brown?

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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Currents in Lake Erie can be dangerous! Any current flowing faster than 2 mph is considered dangerous. Dangerous currents can exceed 5 mph — faster than an Olympic swimmer can swim.

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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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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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Things improved for the lake with the passage of environmental legislation in the 1970s. Bihn believes that Lake Erie is one of the great success stories of the Clean Water Act of 1972, leading some to dub it the comeback lake.

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

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With a mean surface height of 570 feet (170 metres) above sea level, Erie has the smallest mean depth (62 feet) of the Great Lakes, and its deepest point is 210 feet.

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Lake Erie is the fourth-largest lake by surface area of the five Great Lakes in North America and the eleventh-largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and also has the shortest average water residence time. At its deepest point Lake Erie is 210 feet deep.



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Lake Erie is the second smallest Great Lake by surface area, and the smallest by volume. Because of this, the water of Lake Erie also has the shortest residence time. Water in this lake replaces itself every 2.6 years, as opposed to Lake Superior, which takes two centuries.

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Lake Erie has an astonishing 2,000-plus shipwrecks which is among the highest concentration of shipwrecks in the world. Only about 400 of Lake Erie's wrecks have ever been found. There are schooners, freighters, steamships, tugs and fishing boats among them.

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The first recorded swimmer to cross Lake Erie was Pennsylvania teenager Pat Budney in 1975. He swam from Long Point to Presque Isle in Pennsylvania, a distance of 26 miles that took him 26 ½ hours. The state park beach where he finished now bears his name.

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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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Why is Lake Erie so important? Erie is the most biologically productive and diverse of all the Great Lakes due to its warm shallow waters. Alongside this astounding biodiversity, more than 11 million people get their drinking water from the Lake Erie watershed.

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Lake Michigan wrecks: the oldest and the mostest Lake Michigan contains more shipwrecks than any of the other Great Lakes, as well as the oldest recorded one: the French ship Griffon, the first European vessel to sail the Lakes.

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Lake Michigan The Great Lakes are all water bodies that swimmers should think twice about entering. Lake Michigan in particular is the roughest of the Great Lakes, and poses a major risk to those thinking of taking a dip. This body of water is often named the most dangerous lake in the United States.

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Lake Superior is the world's largest freshwater lake by area (31,700 mi2 /82,100 km2). It is also the coldest and deepest of the Great Lakes, with a maximum depth of 406 meters (1,332 feet).

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Lake Superior is the world's largest freshwater lake by area (31,700 mi2 /82,100 km2). It is also the coldest and deepest of the Great Lakes, with a maximum depth of 406 meters (1,332 feet).

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Throughout the past fifty years, Lake Erie has reached a complete ice cover (100% ice coverage) three times – in 1978, 1979, and 1996, and reached 99.8% in 1977. Annual maximum ice coverage for Lake Erie: 1973-2022. Source: GLERL, NOAA.

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