How big can the waves get on the Great Lakes?

In most cases, lakes are confined to smaller fetches which limit wave size, but the Great Lakes are large enough to produce frequent swells up to several metres. However, the highest ever recorded waves were 8.7 metres, outside of Marquette, Michigan, on Lake Superior.



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Consequently, the Great Lakes are considered to be non-tidal. Water levels in the Great Lakes have long-term, annual, and short-term variations. Long-term variations depend on precipitation and water storage over many years. Annual variations occur with the changing seasons.

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The Great Lakes have been known to generate waves of more than 25 feet. They can sink lake freighters over 500 feet long when this happens. Lake Erie is booby-trapped with reefs, numerous sand bars and a wide range of waves and shallows. Some mariners have called it the world's most temperamental lake.

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“The waves hit you every three to five seconds in the Great Lakes, where in the ocean it might be 10 to 12 seconds between waves,” said Guy Meadows, a Michigan senior research scientist.

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From some vantage points, the Great Lakes feel more like vast inland seas than freshwater lakes. But the 6 quadrillion gallons (~23 quadrillion liters) sloshing in Superior, Michigan, Huron, Ontario, and Erie represent one fifth of the planet's fresh water.

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Since Lake Erie, Superior, and Ontario are oriented in the same direction as the path of most storms, each lake's eastern shoreline can expect more swell because the winds can blow across the water for a greater distance. When you have the whole length of the lake to create energy, it creates much punchier waves.

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These lakes are the perfect backdrop for swimming, boating, and other water-related activities. But there can be more danger in these Great Lakes waves than what you'd find in the ocean. The Great Lakes are more than capable of generating waves over 10 feet high, despite being smaller than our oceans.

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Lake Michigan The Great Lakes are all water bodies that swimmers should think twice about entering. Lake Michigan in particular is the roughest of the Great Lakes, and poses a major risk to those thinking of taking a dip. This body of water is often named the most dangerous lake in the United States.

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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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At the deepest measured point, Lake Superior is 1,332 feet, around a quarter-mile straight down. Again, comparing it to the next deepest point in another Great Lake, Lake Michigan comes in second with a depth of 925 feet.

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But what is the tallest wave ever recorded on Lake Michigan? Records show that the highest wave recorded reached 23 feet. It came in September 2011 and was recorded by a buoy that has measured waves since 1981. The largest wave was taller than some houses!

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So you know how when you go for a dip in the ocean and you come out covered in salt crust and with the distinct stench of rotting seaweed? Yeah, that doesn't happen in the Great Lakes. The water may be colder, but it's wonderfully clean.

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Lawrence Seaway is a deep draft waterway extending 3,700 km (2,340 miles) from the Atlantic Ocean to the head of the Great Lakes, in the heart of North America.

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The primary reason for shipwrecks on the Great Lakes is stormy weather, specifically in the upper portions of Lake Michigan, Lake Huron and Lake Superior. In the late fall and early winter, weather can be particularly treacherous. Most Great Lakes shipwrecks occurred in the late fall.

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Threats to the Great Lakes' ecosystems, include invasive species, climate change, pollution, and habitat destruction. Climate change affects water temperatures, weather patterns, and lake levels.

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