Well, if your reading Lewis and Clark stuff, might as well bring up John Colter. He was another cool dude, to say the least, and inspiration for the classic The Naked Prey movie and a great explorer and pathfinder in his own right.
Coulter was one of the hunters on the Lewis and Clark trip. Two weeks from St. Louis on the return he left the expedition and joined with two Frenchmen on a fur trapping venture the eventually led to his famous “Coulter’s Run”.
Not to mention Jedidiah Smith...