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Not a remote possibility...
https://www.msn.com/en-us/weather/topstories/falling-mississippi-river-allowing-saltwater-to-push-upriver/ar-AA13DeRK?ocid=msedgdhp&pc=U531&cvid=0267d0d42e1443728ba222c8a5c300d2
I'm sure it has happened before and will happen again.