Why is Lake Michigan so brown?

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

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The blue in Lake Michigan and Lake Huron is sediment brought to the surface when strong winds churned the lakes. The green in Lake Erie and in Lake Huron's Saginaw Bay is algae, which builds on the surface when winds are calm.

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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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The United States Environmental Protection Agency, for example, describes them as “vast inland freshwater seas.” A seminal 2017 paper in Limnology and Oceanography, authored by some of the most influential researchers studying the lakes, also refers to them as 'inland seas.

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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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The Great Lakes could be considered a failed ocean. They are in a place where rifting started to create a new ocean, but it never got connected to the ocean system (and flooded), and that was still the case when the rifting eventually stopped.

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Lake Michigan is a treasured natural resource that provides Chicago families with water recreation activities such as beach days, swimming, boating and sailing.

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Due to their nature, Lake Michigan is a freshwater lake, so dolphins cannot survive here. The marine mammal, called the harbor seals, are only found in the Great Lakes, particularly in Lake Michigan, Lake Huron, and Lake Superior.

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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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There is an abundance of life and different creatures you might find in Lake Michigan. Whales just aren't one of them. See all of the animals you can find in the lake here.

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Chicago's entire 28-mile Lake Michigan shoreline is man-made. The original sand dune and swale topography has been dramatically altered. Before American settlement, storms changed the shoreline, either by building up or eroding sand.

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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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1. Blue Lake, New Zealand. The Blue Lake is the clearest lake in the world. New Zealand is well-known for its natural beauty, with mountainous terrains surrounding crystal clear lakes whenever you hop out of the city.

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The Weddell Sea has been claimed by scientists to have the clearest waters of any ocean in the world. Described by a historian as “the most wretched and dismal region on earth”, due to the flash freezes that caught Shackleton's ship, its clarity is only belied by the sheer depth of the ocean below.

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