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Quality post Delawareriver.
At these water temperatures, you only have a few minutes before you're over-taken by hypothermia and lose the ability to swim. (Think of the ending of the movie Titanic.)
Here is a hypothermia chart that approximates how long you will be able to stay conscious in the water at a given temperature.
http://www.sheboyganyachtclub.com/as...sion_Chart.pdf
