no hijack intended, but having been up and down that road several times i would proceed with caution.
Now for the hijack... I remember that race, my wife and I were on the river that week doing a GR to confluence in our sea kayaks. We got down to Ruby and saw the big film/support raft and bummed some ice. Later we were on a sand bar below Trin alcove sipping icycool beers and watching the racers go by. They were looking at us like we were aliens. "what are they doing there" they would say. When we got to MB they were all dazed and confused " why would someone do this for fun" they were asking. Years later I met one of the racers and we boat together often, he still has one of the PFD's.
I can't imagine the agony those racers went thru, it sounded like a pretty tough course.
more snow = more water