1) PMD sz 14 16 18
2) Hopper patterns , at least 3 different colors
3) Royal trude sz 14"ish"
4) Elk hair caddis sz 12-18 (IN ALL COLORS!)
5) BWOs sz 16-20
6) Prince nymph sz 10-14
7) Cased caddis sz 10-14
Yellow sally sz 10-12
9) PED or Light Hendrickson (I like the para versions) sz 16-20
10) Clarks stone BIG! ( with rubber legs prefureably) sz 8-10
Try the big flies with a dropper, the Prince Nymph works well for me.
Might want to add an 11th fly, a may fly nymph pattern. A pheasant tail in a small size ("18ish") or a small emerger type, both are killer as droppers.
Also the cased caddis with an emerger fished DEEP in a two or three nymph rig is good for the hot mid day times with no hatch on.
This list WILL get you by on most big western rivers.