Why does Lake Superior have the best water quality?

Lake Superior's forested watershed and coastal wetlands help maintain water quality and a healthy aquatic ecosystem. Based on the assessments of the nine State of the Great Lakes indicators, the overall status of the Lake Superior basin ecosystem is Good and the trend is Unchanging.



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Lake Superior has been described as the most oligotrophic lake in the world because it's so nutrient poor. It still has plenty of nutrients to support the plants and animals that live in it though. This lack of nutrients keeps the water as clear as you see it here.

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Lake Superior is a vast fresh water resource that has not experienced the same levels of development, urbanization and pollution as the other Great Lakes.

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Yes, Lake Superior is safe for swimming.

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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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As for pollution, Lake Superior is the cleanest of the five Great Lakes. The lake's massive size helps dilute any pollutants that enter the water. Plus, it has fewer farms along its shores, reducing pollution. However, even though the lake is doing great, it could be doing better.

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Lake Superior holds a massive volume of water because of its enormous inland basin and the hundreds of rivers that feed it.

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The wreck of The Emperor in Lake Superior is said to be haunted by a crewman who continues to go about his duties, even in death. The creepiest haunted wreck, though, is the SS Kamloops, which sank off Isle Royal in Lake Superior in 1927.

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Lake Superior freezes at least in part every year and less frequently in its entirety. The last year that it froze completely was in February 1994. It almost froze completely in March 2003 and this photograph was taken by the GOES satellite on March 7, 2003.

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Lake Superior is truly an inland sea. Weather, navigation and buoyage are taken seriously and monitored by federal maritime agencies.

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Minor changes are expected over the next month with lake levels forecast to drop about two inches by Sept. 11, 2023. The water level on Lake Superior dropped one inch from July 11, 2023 to Aug. 11, 2023.

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