First of all I have to recommend that you get a hold of Philip Rowley's book Fly Patterns for Stillwaters: A Study of Trout, Entomology and Tying. It is the best book I have read about stillwater fishing.
Having said that here are my recommendations.
* indicates patterns found in Rowley's book
Dry Flies
- Callibaetis Sparkle Dun, #12-#16
- Callibaetis Cripple, #12-#16
- *Callibaetis Spinner, #14-#18
- *Mikulak Sedge #6-#10,
- Griffith's Gnat, #14-#18
- *Raccoon, #12-#16
- *Adult Damsel (brown and blue), #8-#12
- *Foam Ant, various sizes and colors
Wet Flies, Nymphs, and Streamers
- *Any Black Chironomid Pupa
- *Any Red Chrironomid Pupa
- San Juan Worm
- *Water Boatman, #10 & #12
- Soft Hackle(various colors) #8-#12
- *Any Damsel nymph
- *Half Back, #10-#14
- *Any Dragon Nymph
- *Any sort of Bugger in various sizes
- Clouser Minnow, #8-#12
Good luck!