Name a marshy creek or swampy backwater of a river or lake.They are very common in the United States?

Answer 1

This might also be called a "slough ".

Here's the definition of slough from the Encarta World English Dictionary: "swampy area: a stagnant area of water connected to a larger body of water such as a marsh, inlet, bayou, or backwater".

And here's a definition from Wikipedia: "In eastern and southeastern United States, a slough is a type of swamp or shallow lake system, typically formed as or by the backwater of a larger waterway. It is similar to a bayou with trees being present (that is, a swamp), and unlike a bog or marsh that lacks trees. It can also refer to the area of deeper water between a sandbar and a beach or between two sandbars."

Joy

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Answer 2

Well, there's the Muddy Boggy, in Oklahoma.

Answer 3

I believe you're referring to a bayou :-)