Aspects of this topic are discussed in the following places at Britannica.
...very cold periods. At other times all the water in a small stream freezes; subsequent inflowing water then flows over the surface and freezes, forming large buildups of ice. These are known as icings, Aufeis (German), or naleds (Russian). Icings may become so thick that they completely block culverts and in some cases overflow onto adjacent roads.
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