Originally Posted by LSB
I asked a a couple of YNP rangers one time about the closed rivers and "Historical use" was the answer I got.
I challenged with Lewis and Clark and they didn't really have an answer.
Interesting. They should have had a comment as Lewis and Clark never entered the park (as we now know it) neither on foot nor by boat. John Colter traversed it (on foot)and reported back upon returning to "civilization" and the area was nick named "Colter's Hell". That should have been a no-brainer for them - either they didn't want to argue or they were not very well informed.