If you swallow a drop of water from Lake Michigan, it will contain roughly a million bacterial cells and 10 million bacteriophages—tiny viruses that infect bacteria and may outnumber every other organism on Earth.
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Lake Michigan is generally clean and safe for swimming but it can become contaminated with harmful bacteria.
Lake Superior is the Cleanest and Clearest Great LakeBecause 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.
Escherichia coli (E. coli) is a type of fecal coliform bacteria that live in the intestines of animals and humans. The presence of E.coli in the water along Lake Michigan's shoreline is a strong indication that the water was recently contaminated by sewage or animal fecal waste.
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.
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.
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.
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.
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.
Lake Karachay, a small lake in the southern Ural mountains in western Russia, is thought to be the most polluted spot on Earth. Starting in 1951, the Soviet Union used Karachay as a dumping site for radioactive waste from Mayak, a nearby nuclear waste storage and reprocessing facility located near the town of Ozyorsk.
Chemicals, toxic pollutants, pesticides and heavy metals entered the Great Lakes; they flowed from thousands of factory discharge pipes and sewage plants, seeped from dumping and disposal sites, escaped from smokestacks, and ran off millions of acres of cities and farmland from states surrounding the lakes.
Naegleria fowleri infects people when water containing the ameba enters the body through the nose. Infection is rare and typically happens when people go swimming, diving, or put their heads under water in warm freshwater places, like lakes and rivers.
Permanent white settlers did not begin to arrive in the area until the 1830s. At that time, the lake was known as the “Bottomless Lake”. In 1867, it was named “Hubbard Lake” in honor of Dr. Bela Hubbard, who was a prominent geologist in the state of Michigan.