from hmdb.org
You ask me, that's a little boat. But yet, George Rogers Clark left us little clue as to the boats he used to get down the Ohio, other than the fact the guide John Saunders had to talk him out of sinking them when they got to Fort Massac(The image was taken from the Floodwall in Paducah, ky, just up the river.) But that does tell us something besides he wanted to leave no tracks. One of the other themes of the Vincennes expedition was that done on a bare bone budget, with Colonel Clark signing a string of IOU's with full faith and trust of the Commonwealth of Virginia, which he then had to pay back when he became General Clark and Virginia repudiated the notes. So what would be cheap, disposable, and carry a lot of cargo? The only disadvantage is that they are impossible to get upstream, but I imagine that Colonel Clark had planned on crossing the Mississippi and throwing himself on the mercy of the Spanish Governor there. At least that's how I wrote it.
