[adolph]

Aside from rising seas, there is regional destruction of protective barrier islands from poor resource management and sedimentary processes that should have moved the agriculture transshipment activities of BR/NO to the Atchafalaya River in the recent past. This is easier said than done and there is a strong video about how the Mississippi’s current path has been maintained by the Old River Complex:

https://youtu.be/XpjPe4kbpYo

Edit: better video