ya some of for sure know about the river rising fast eh there Wagonmaster
we were there a few years ago and the river was damned up in the canyon so people were scattered everywhere on little newly created islands catching fish all over. the river slowly dropped over the morning hours we noticed and wondered why. well at around 130-2pm ish we heard this huge rumbling like thunder and as we looked towards the noise we could see this wall of water and debris barrelling down on us. my dad(wagon) was on an island across from us with a fish on and tried to snap it off as fast as possible. he did manage to make his way through the water after waiting for the initial blow of debris came by, he was up to the top of his waders in full current and with full sized trees coming. he could have been killed at any moment, I was standing by the water with a long large stick incase i had to reach it to him.
in about 5 mins and i mean it thats not an exxageration the water came up about 4-5 feet
this of course doesnt happen often but just remember it can so try not to trap yourself in certain places without an escape route
HOOK