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I belive you refer to either an Estuary(such as the East river) or a Tidal basin. in this zone there would be a mixture of fresh and salt water, naturally the latter retarding the formation of ice, a natural anti-freeze as salt water has a lower freezing point.That is why the Hudson rarely freezes and even pack ice is rare-of course shiptraffic churns things up.

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10y ago

What else can I help you with?