Illinois riverboats tend to appear in Chicago and are stuck in lake Michigan. Other ships are developed in Detroit and seem to be stuck on lake Ontario, etc.
Someone mentioned that some ships can move through the ohio and eire canal, but not deep draft ships, so their still stuck. Furthermore lake Michigan is not connected to any canal due to the top of the map being cutoff.
Could this be patched so that IL ships never build in Chicago. Illinois has good river frontage and good industrialization it's a shame its wasted.