How cold is the bottom of Lake Michigan?

The deepest part of Lake Michigan is over 990 feet. The water at the bottom of that deep pocket is still 39 degrees to 40 degrees.



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The deepest part of Lake Michigan is over 990 feet. The water at the bottom of that deep pocket is still 39 degrees to 40 degrees.

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While the temperature of the surface of Lake Superior varies seasonally, the temperature below 110 fathoms (660 ft; 200 m) is an almost constant 39 °F (4 °C).

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Though not as warm as the oceans, temperatures of Lake Michigan do rise to the high 60s in July and August to make swimming enjoyable, and definitely refreshing! Rarely do temperatures make it to the 70s, unless air temperatures stay up in the 90's for many continuous days.

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Lake Michigan in particular is the roughest of the Great Lakes, and poses a major risk to those thinking of taking a dip.

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Erie is the most southerly, shallow, and biologically diverse of all of the Great Lakes. Its shallow depth makes it the warmest Great Lake and a favourite destination for summer recreationists and migrating birds.

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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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At 1,943 feet (592 meters), Crater Lake is the deepest lake in the United States and one of the deepest in the world. The depths were first explored thoroughly in 1886 by a party from the U.S. Geological Survey.

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Lake Superior is the world's largest freshwater lake by area (31,700 mi2 /82,100 km2). It is also the coldest and deepest of the Great Lakes, with a maximum depth of 406 meters (1,332 feet). By most measures, it is the healthiest of all the Great Lakes.

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Geology of Lake Inferior Lake Inferior is an underground lake that is located beneath Lake Superior. It is believed to be formed by a process known as karstification, which is the dissolution of limestone and dolomite rock. This process creates sinkholes, caves, and underground rivers and lakes.

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Situated in south-east Siberia, the 3.15-million-ha Lake Baikal is the oldest (25 million years) and deepest (1,700 m) lake in the world. It contains 20% of the world's total unfrozen freshwater reserve.

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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.

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Here's Why Lake Michigan Is Supposedly the Deadliest of the Great Lakes. Compared to the other Great Lakes, Lake Michigan is considered to be the deadliest of them all. Here's why. Sadly, many of the Great Lakes aren't considered to be particularly safe to swim in, due to high pollution levels and strong currents.

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Lake Superior is the largest of the Great Lakes by surface area and volume. It is like a mini-freshwater ocean, you can't even see the other side from the Wisconsin shoreline.

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11 Most Beautiful Beaches In The Great Lakes
  • Saugatuck, Michigan (Lake Michigan) ...
  • Long Point Provincial Park, Ontario (Lake Erie) ...
  • Beach Park/Illinois Beach State Park, Illinois (Lake Michigan) ...
  • Port Stanley, Ontario (Lake Erie) ...
  • Indiana Dunes National Lakeshore, Indiana (Lake Michigan) ...
  • Marathon, Ontario (Lake Superior)


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Safe for Swimming? The answer is, it depends. Under the right conditions, Lake Michigan is safe for swimming. But this lake can also present dangerous, even deadly, conditions for swimmers.

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Lake Erie occupies a basin that was carved out of Earth's crust over millions of years by rivers and glaciers. The oldest rocks from which the basin was carved are about 400 million years old and formed in a tropical ocean reef environment.

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