re: Anyone have a camp at Larto?

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Opening the Morganza Spillway has no effect on the water levels at Larto, or anywhere upstream of the spillway itself.

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TLDR: Morganza/Bonnet Carre do nothing for us upstream!

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I have zero education/training on this, but it just doesn't make sense to me. I guess I am thinking that it's like any other container, and the more exiting, the faster the container will empty. Just doing some googling,

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The Morganza may be needed because the Bonnet Carre alone may not bring enough relief—upstream at Red River Landing

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"It's another way to get water out of the system," said Chris Accardo, chief of operations for the Corps' New Orleans District. "The hydraulic folks will tell us each day which gates to lift so we can maintain 1.5 million cfs at Red River Landing.

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So, they are mentioning upstream levels here.

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The Morganza Floodway has never been used as planned to protect New Orleans. A flood that large has not yet happened since the project was finished in 1954. The structure was opened once, however, in 1973. While that was during a major flood, the reason for opening the structure was to take the pressure off of the Old River Control Structure just upstream. The Morganza Floodway drained off enough water and the Old River Control Structure held, saving the day.

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Again, I know zero about this.