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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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.
Lake Superior is barely developed, compared to the other Great Lakes. This has allowed it to remain relatively undisturbed and free from much of the pollution and habitat destruction that the other lakes have suffered.
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.
Lake Annecy, FranceLocated in the Haute-Savoie department, which borders Italy and Switzerland, Lake Annecy is a pristine body of water that's often called the cleanest lake in Europe, thanks to strict environmental regulations set in place in the 1960s.
Lake Annecy originates from around 18,000 years ago, as a result of the melting of glaciers in the Alps. Today, it is considered the second largest lake in France and it has the title of the cleanest lake in Europe, due to strict environmental regulations introduced around 1960.
Lake Erie is the fourth-largest lake in North America (by surface area) and the eleventh-largest worldwide. It is the Great Lakes' southernmost, shallowest, and smallest by volume. By the 1960s, Lake Erie had become the most polluted of the Great Lakes, owing to the substantial industrial presence along its coasts.
Lake Michigan has the longest stretch from north to south of all the Great Lakes, giving it a very diverse climate, which allows for a wide variety of plant and animal species. The lake boasts a variety of natural habitats, including tallgrass prairies, wide savannas, and the world's largest freshwater sand dunes.
Lake Michigan: No more than 1 MI serving per month. Portage Lake in Houghton County: No more than 2 MI servings per month. Gull Lake in Kalamazoo County: No more than 2 MI servings per month. Higgins Lake in Roscommon County: No more than 4 MI servings per month.
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.
Lake Ohrid is considered the deepest and oldest lake in Europe. It was reported that the Lake has the most biodiverse freshwater bodies of water in the world with many endemic species.
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.
The Great Lakes are not (noticeably) salty because water flows into them as well as out of them, carrying away the low concentrations of minerals in the water, writes Michael Moore of Toronto. Eventually, this water, with its small load of dissolved minerals or salts, reaches the sea.
Pollution. Lake Erie and Lake Ontario are generally considered the most polluted of the Great Lakes, but Lake Michigan's waters also contain an unacceptable level of pollutants. Most of the pollution is plastic waste, though, which poses little risk to swimmers.