I can't claim to much knowledge in this particular area, but my impression is that, at the moment, the answer is: unfortunately, no.
The best-known riverboat kit for many years probably was the old Pyro Robert E. Lee. It wasn't a bad kit for its age (the early or mid-fifties), but by modern standards it suffered from pretty mediocre detail and dowright miserable fit. The last time I saw an example of this kit it had a Lindberg label on it. That was quite a few years ago; I haven't seen one in a long time.
That kit was also sold for a while under the name "Natchez." It represented that boat so inaccurately that, for a while, Pyro was printing the phrase "the within model is similar to the Natchez, but is not an exact duplicate. 'Nuff said.
The Robert E. Lee has, of course, been a favorite among kit manufacturers. Revell offered a small one for a long time; it was, in some respects, a little better than the Lindberg version. (If you go in search of a Revell Robert E. Lee on e-bay, though, try to find an old one. In the late fifties or early sixties Revell modified the mold to accommodate an electric motor and batteries. The result was that the hull got deepened considerably - and very unauthentically. Subsequent reissues didn't have the motor, but did have the too-deep hull.) ITC made one many, many years ago; I don't remember much about it, except that it was far beyond my skills as a six-year-old when my parents made the mistake of buying it for me. Bluejacket used to offer a wood Robert E. Lee, but it's been gone from the catalog for some years. Maybe our Forum friend Al Ross can tell us something about that.
Quite a few years ago, at a Nautical Research Guild meeting, I listened to John Fryant, one of the country's most respected steamboat experts, give a talk on a model of the Lee that he'd built. Mr. Fryant categorically stated that all the extant Robert E. Lee kits were "wrong." He was convinced that, for instance, the real boat had a round-bottomed hull, and various other features that the model companies had missed.
There probably have been other riverboat kits, but those (along with the awful HECEPOB ones and the Lindberg Clermont and Southern Belle) are the ones I know about. It's a shame the kit manufacturers haven't paid more attention to them. They make wonderful models.