Do rivers freeze faster than lakes?

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.



People Also Ask

ice in lakes and rivers, a sheet or stretch of ice forming on the surface of lakes and rivers when the temperature drops below freezing (0° C [32° F]).

MORE DETAILS

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.

MORE DETAILS

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.

MORE DETAILS

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.

MORE DETAILS

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.

MORE DETAILS

Before a lake can freeze over, its entire water column from top to bottom, must reach that magic temperature (39.2° F or 4° C). This natural cooling process is called fall overturn. It is a gradual process as the surface water slowly cools down and a larger and large layer of water can be mixed by the wind.

MORE DETAILS