Corrected entry: Ice melts from the outside in, so the dam should have melted at the same time as all the water behind it.
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Correction: Yes ice does melt that way but the water behind the dam was most likely a river that had been blocked by the movement of a glacier. Ice dams did exist during the ice ages, some of them holding vast amounts of water and they still exist today in places such as Iceland. Here is some information on ice dams: http://en.wikipedia.org/wiki/Ice_dam.
Andreas[DK]