I usually give the creek 4 or 5 days to settle down when the creek hits at about 300+, beatis and very small tan pupa or midge in morning, right around 1pm the mayflys start working. Switch up a lot move a lot until you find fish if you hook up stay put most likely a pod of fish in the hole. Think deep and finding the right bug. Many many times I've smelled like a skunk only to tie on the right color midge , mayfly , micro Caddis or even San Juan worm then bam bam it's on then time to move and/ or switch up again.
At 300+ I fish a bb in fast water and tail outs adjust leader length a ton for hook ups