What about the lake Missoula ice dam break that flooded eastern Washington and the Columbia Basin
https://www.iafi.org/ice-age-floods-videos/?playlist=f856840&video=fa7189c
What about the lake Missoula ice dam break
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That was another result of glacial melt - likely a glacier lake formed on top or underneath and burst. A result not a cause.
The Ice Caps had been melting for some time before the strike occurred. I don’t recall now just were the lake Missoula ice dam break happened in the time line.