I know they would be near the coasts. I have been to Gulfport Mississippi (which is not actually on the river mind you) and have seen them. New Orleans is also one of the Largest conex handling ports in the world IIRC and they are about 90 miles upriver.
I was not sure if they would be upriver especially WAY upriver near Illinois.
I did find a useful link from the link provided. Thanks
https://en.wikipedia.org/wiki/Container_on_barge
Quote:
Mississippi River & tributaries COB
There is limited use of this mode of transport because a lack of infrastructure on the upriver side in the United States. With the development of the Louisiana International Gulf Transfer Terminal at the mouth of the Mississippi River, container on barge traffic could become mainstream.
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The link shows it is possible to st louis, but not mainstream yet. It even gives nice logistic numbers for the possibility of moving through locks.