Surely private commerce on the Mississippi was quite heavy during the civil war after Vicksburg.
According to a
Jun 19, 1864 NY Times article, in the 9 months between September 1, 1863 and June 10, 1864, 228,500 bales of cotton arrived in New York, 37% (83,500 bales) from New Orleans by sea and the rest by interior and rail routes. New Orleans had exported 113,300 bales in the same period, 106,800 bales from Louisianna and Mississippi and the rest "prize lists" from Mobile and Texas.
An
April 5, 1864 NY Times article seeks to refute claims that commerce has not renewed on the Mississippi, writing: "...Here let me say that I see in rebel and European papers the statement that the navigation of the Mississippi is not open practically. This statement is moonshine. So far is it from the fact that steamboats are constantly arriving and departing at St. Louis, Louisville and Cincinnati, to and from New-Orleans, with heavy freights. They are rarely fired on, and none have recently been injured. So, too, they talk as if we had no cotton. More than 60,000 bales of cotton have arrived at Cincinnati in seven months, and more has been carried to Western ports than in any year; so, also, have heavy cargoes of Louisiana sugar. I say this merely to add that the reopened navigation of the Mississippi is of great practical importance. ..."