Here is a map of the flooded areas from the Great Flood of 1927.
Mississippi River Meander Belts, from a set of maps created in the 1940s.
What happens if the ORCS fails:
https://biotech.law.lsu.edu/la/geolo.-ocr-small.pdf
The Fisk Report, that triggered the creation of the ORCS:
https://biotech.law.lsu.edu/climate/.952-report.pdf
Project Flood and the Mississippi River Flood control design:
“A 100 year flood” doesn’t mean what you seem to think it means.
The floods of 1935 and 1947 rivaled 1927 for river stage.
What we see now is driven by physical changes to the land drained by the river as well as to the river itself, some (most?) man made. This process has been going on at an accelerated rate since long before we burned carbon.
FYI
I'm not aware of any official tours being conducted during high river stages, maybe but I doubt it. If you just want to see the areas at high river stages, drive through Morganza on Hwy 1, over the Morganza Control Structure, and continue north on Hwy 1, then turn right on Hwy 15 which will take you to the Old River Complex. As long as traffic is still being allowed over the Low Sill structure you will be able to get an idea of how mighty the Mississippi is. Black Hawk Plantation is a few miles north of the ORCS's which is the upstream limit of the USACE New Orleans District authority. From there Vicksburg District takes over.
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