To what Andy said, I’ll add: beware of ice dams breaking free UPstream of you, on warm sunny days. A clear section, can potentially fill up, if things come down from above.
Also, sometimes Big Horn canyon on the Ark goes in winter time. I’ve run it in January before, during an abnormally warm year...
The river probably thought, “ he is such an insignificant, pitiful, little creature, with such a short time to live, I will let him go this time, and try to teach him something” - Buzz Holmstrum