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So you're saying that if ORCS did fail, there would be absolutely no water flow down the MSR? Curios question. I dont think the entire river would flow down the atchafalaya.

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I do think there would be some flow, but at drastically reduced levels reducing over time, and wherever the riverbed meets 0'0" elevation, that comes the new mouth of the river, most likely somewhere between New Orleans and Baton Rouge.

There would still be a port for New Orleans, but it would be a saltwater one, not freshwater.