The depth depends on so many different things including the state of tributaries that empty into the river.
The Army Corps of Engineers has to maintain a 9 ft depth across a 400 ft width of the river, for the barge traffic, but that is by no means the deepest part of the river.
The record depths for the Beale Street gage in Memphis is 234.31 feet as the record high with a record low of 173.91 feet. At that gage the river is very narrow compared with up and downstream widths, so it would include the deepest part of the river.
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The Mississippi creeks can get from 3 ft to 8 ft deep. On average depth, most parts of the Mississippi river would be as much as 75 ft.
60 feet
the river running through rock wear it down into deep valley with the steep sides what is it called
It's a gully. Rills are smaller ditches cut by running water, but can be plowed over. Once the ditch is so deep it can't be plowed over, it's a gully.
The deep tree roots help prevent the soil from eroding.