I'm not a beaver trapper by any means but I did some control work on some nuisance beaver for a rancher and I used John Grahams Cache Creek. It must be good lure! I was able to leghold 6 beaver out of one colony.
You pro beaver guys can laugh at me if you want to for this but it did work. I took some fish oil that I use in making my bobcat lure and poured a little above my trap and let some run down into the creek. As I was pulling out of there I watched a beaver actually swim a straight line to my set and get caught.