The Atchafalya does not even need levees detonated. One day, just about all of the Mississippi will shift to that channel. Almost happened in 1972. Look up Old River Control Structure for history.
You are correct. We used to live in Youngsville and Lafayette, just west of the swamp. Drove over it (beautiful) frequently on I-10.
My wife is a Ragin’ Cajun.
You from Cajun country?