A river icebreaker is an

icebreaker An icebreaker is a special-purpose ship or boat designed to move and navigate through ice-covered waters, and provide safe waterways for other boats and ships. Although the term usually refers to ice-breaking ships, it may also refer to smaller ...

specially designed to operate in shallow waters such as rivers and

estuaries An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environment ...

, and often able to pass through canals and under bridges. As published by the American Society of Civil Engineers almost a century ago, "On some rivers, particularly where melting first takes place on the upper river, as on the

Oder The Oder ( , ; Czech, Lower Sorbian and ; ) is a river in Central Europe. It is Poland's second-longest river in total length and third-longest within its borders after the Vistula and Warta. The Oder rises in the Czech Republic and flows thr ...

and Weichsel in Germany, the formation of ice jams is a frequent cause of floods." River icebreakers can operate in any navigable waterway to prevent such ice jams. Various river icebreakers, from smaller vessels to the nuclear-powered shallow draft icebreakers ''Taymyr''-class ''Vaygach'' and ''Taymyr'',Russian nuclear icebreaker is working around the clock to clear vessel jam in Gulf of Finland
Helsingin Sanomat. are also in service in the large rivers of the Russian arctic. The oldest river icebreaker in the world that is still in service is the ''

Kuna Kuna may refer to: Places * Kuna, Idaho, a town in the United States ** Kuna Caves, a lava tube in Idaho * Kuna Peak, a mountain in California * , a village in the Orebić municipality, Croatia * , a village in the Konavle municipality, Croatia ...

''.

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* * * * {{ship-type-stub Icebreakers Ship types

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