I did Alto with Dave once, it was about 1000. Everyone else showed up with their creek boats, I think I was in a Delirious or something. The waves were sweet at that level.
I remember a wave/hole just below the put-in that no one surfed (too big), some boogy, a gorge with some debris and gradient that snook up on us.
Above the take out trestle there was a sweet ass wave, one shot, river left, almost next to the road.
Another time we hiked up above the run & the train tunnel, if I am remembering this correctly and ran some low volume mank (creeky).
Life is either a daring adventure or nothing. Security does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than exposure. - Helen Keller