Why is Lake Michigan so dark?

When the lake is deep, and the angle of incoming light is smaller, Lake Michigan's color appears deep blue. This is because the light travels down with little obstructions and dissipates far below the surface. The light then appears darker in the visible spectrum.



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Sediment, dissolved plant bits, tiny photosynthesizing plankton — they all influence the dance between light and water. So does the angle that sunlight hits the water or the presence of clouds overhead. It seems like every time you look at Lake Michigan, it's a different color.

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Overall, Lake Michigan's coloration is caused by a combination of factors. This includes the behavior of light in relation to water depth, refraction, reflection, and suspended particles in the water. It can also be a sign of water quality.

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Lake Michigan is generally clean and safe for swimming but it can become contaminated with harmful bacteria.

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Lake Michigan, by volume, is the second largest Great Lake and the only one located totally within the United States. It serves as a source of drinking water, as a place for swimming and fishing, and as a scenic wonderland. Water from Lake Michigan enters the intake crib at depths of 20 to 30 feet.

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Dreyer is the only person who has swum the width of Lake Michigan between Wisconsin and Michigan, having swum from Two Rivers, Wisconsin, to Ludington, Michigan, in 1998. In the 2023 swim, he was attempting to beat his own record by swimming 25 miles further in the route from Milwaukee to Grand Haven.

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The lake's formation began 1.2 billion years ago when two tectonic plates moving in opposite directions left a giant scar—an event now known as the Midcontinent Rift. Less than 15,000 years ago, melting glaciers filled the giant basin, and Lake Michigan came to be. The lake's maximum depth is 925 feet.

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Invasive zebra mussels are mostly responsible for the increased clarity of Lake Michigan. About 25 years ago, Lake Michigan's water was somewhat of a brownish-green color, very different from the pristine blue-green appearance of today.

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A north-northeast wind has pushed the warmer surface water along the Michigan shore back toward the middle of Lake Michigan and brought up colder water from well beneath the surface. This process is called upwelling.

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Europeans derived Lake Michigan's name from the Anishinaabemowin word mishigami, meaning “big lake.” It is the second largest Great Lake by volume and third by area surface; it is the only one located entirely within the United States.

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Lake Erie and Lake Michigan are ranked the third and fourth most polluted lakes in the United States, according to nature website AZ Animals.

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Pollution is present in the lake, mostly from plastic waste that, while posing minimal risk to humans, can harm animals in and around its waters.

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Lake Superior is the Cleanest and Clearest Great Lake Because of its somewhat isolated location and long cold winters, not much farming is done along Superior's shores. This means lower amounts of nutrients, sediments, and organic material are floating around the lake.

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Two Coho fishermen pulled a 29-inch shark from Lake Michigan about two miles off the Milwaukee shore on April 25, 1969. The shark was dead, but for several days fishermen in the area were uneasy.

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The Michigan Supreme Court determined that the public has a right to walk along the shores of the Great Lakes, even on privately-owned land.

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Should you shower after swimming in Lake Michigan? Take a shower: Bathe yourself after swimming in a lake in order to maintain hygiene and stay clean. If bacteria has not entered your body, it may be actively resting on your skin, creating a rash or finding an open cut to infect.

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