rocket,
I usually fish dries when the trout are rising to them. that given it depens on the time of year. early season I will use size 18 blue winged olives, size 18 grey caddis, and size 14 quill gordons. when the hendricksons are hatching i will use 12-14 hendricksons and red quills. later on I will use sz 14 pale evning duns, 12-14 ligth cahills, size 16-20 sulphurs with size 14-18 caddis thrown in for good measure. in the summer smaller summer goddesses sz 18-22 yellow quills and 22 nedhemi and tricos in the fall mostly 18-22 blues winded olives. the fly type and size will change as the hatches do. now you can catch fish on one or two patterns as has been proven by some but if you give them a close match to what is on the water you will get far more takers. if they ain't risen I am fishing west and nymphs.

Steve