[Ozark Tom]

The elevation of the Mississippi River channel bottom continues to increase relative to the Atchafalaya River.

Old River Control Structure 1973 flood:

https://www.johnweeks.com/river_mississippi/pages/lmiss23.html

[arthurus]

That’s why the levees. The silt does not contribute to the delta. It washes out to sea or it stays in the channel.