The current maximum draft allowed on the Upper and Lower Rivers, to the best of my memory is 9 ft.that's up to 4 ft less than normal water levels allowed. That's a lot of tonnage that is NOT getting moved now.
The Max Allowable Draft on the Ohio River is 8.5Ft. That's even more tonnage per barge that is NOT being moved downstream.
Down here in Lousy-anna, we have enough water that the Calcasieu (Lake Charles, La) and Leland Bowman (Intracoastal City, La) Locks are not allowed to work normally so as not to block the flow of flood level waters from the interior to the Gulf of Mexico.
We are looking at a "bumper crop" of Crawfish this year which will also drive the price down somewhat.
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QMC, USCG (Ret)
The best luck is what you make yourself!