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29 Aug 2016

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What does Floods ravaged the Midwest in 1993 as the confluence of the Missouri and this river moved 19 miles upstream mean?

This is a question in Jeopardy Quiz Show.
http://www.j-archive.com/showgame.php?game_id=2...

I checked wiki, but I don't understand "a river moved 19 miles upstream."
If this is written, for instance "the river moved 19 miles to the north," I think I got the picture, but "upstream"? Rivers flow from upstream; but do they move upstream?
https://en.wikipedia.org/wiki/Great_Flood_of_1993
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