Luddite & Bob!
Thanks for your help! I should have remembered "The Guide to Idaho Paddling", since I know Ron Watters, and was impressed with the book, and of course own a copy.
Ron did some incredible epic winter journey's across the Idaho Wilderness back in the 1970s.
I'll see what I can do with my beginning IK students. One of them is the permit holder for our late July Middle Fork Salmon trip.
As I have learned: it is self-defeating to kill or injure the permit-holder before the trip.