Do ice crystals form in running super-cold water? Crystals of sugar form in hot saturated sugar solution as it cools down, due to excess sugar molecules not fitting in the solution and precipitating as crystals.

In a similar situation, if we have a region where temperatures are well below zero, still water should freeze. But in rivers, water doesn't freeze, because it's flowing. Do ice crystals form in such super-cold water?

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A snippet from the linked question:

Fred says:
Also, while water is flowing its potential energy is constantly being converted to heat energy that resists freezing on the molecular level and subsequent crystallization.
For flowing water to freeze, the temperature would have to be exceptionally cold