Has a river ever frozen?

The winter of 1917-1918 was one of the worst on record when the Ohio River froze along its entire length. The ice gorge crushed and sank the Princess, one of the passenger steamboats to Coney Island. Folks have fresher memories of when the Ohio River froze during the 1976-1977 and 1977-1978 winters.



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There's a stillness that comes with rivers in winter months. Many rivers freeze over in the north, while some rivers in the south have never seen ice.

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The river froze over at St. Louis at least 10 times from 1831 to 1938, when completion of the Alton Lock and Dam corralled much of the ice from the upper Mississippi and Illinois rivers. Better weather often brought peril on the revived river. Disintegrating jams destroyed riverboats and freed surges of water.

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The worst-ever dry period occurred in the late 1500s. However, the dry years of 2021 and 2022 exceeded the 1500's drought length. This means the last 22 years are the driest in 1,200 years.

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Turbulence and mixing keep the river's temperature from falling as fast as on the surface of a lake, according to John Wheeler. Why do rivers remain unfrozen longer than lakes? Water has an unusual property of being at its most dense at around 38 degrees.

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The answer again lies in physics. For any stream of moving water to freeze, it takes more than a simple drop in temperature. Heat must be lost at a rate that exceeds the rate of replacement: the rate at which flowing water is replaced by water of potentially higher temperatures upstream.

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What will happen to the US if the Mississippi River dries up? If the Mississippi River dries up, transporting crops and goods up and down the river will no longer be a problem because there will be no crops to ship out and nobody left in the Midwest needing anything shipped in.

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Glaciers are called rivers of ice. Just like rivers, glaciers have fall lines where the bed of the glacier gets narrow or descends rapidly. Ice flows down the icefall just like water falls down a waterfall.

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The high concentration of salt in ocean water lowers its freezing point from 32° F (0° C) to 28° F (-2° C). As a result, the ambient temperature must reach a lower point in order to freeze the ocean than to freeze freshwater lakes.

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