Dry fly
Adams
Universal mayfly dry
Trout · GraylingSurface
The fly you tie on when you're not sure what to tie on — and it works rather more often than it has any right to. Grizzle over cream, sitting low in the film, suggesting a dun without pinning the fish down to a particular one.
Fish this when
Olives or pale mayflies on the water, spring through autumn. Your searching pattern when you can't read the hatch clearly.
Why it works
Trout see dun, not formula. Grizzle hackle bridges olive and pale. Sits properly in the film. Confidence fly.
Naturals it imitates
generic upwing dun
Typical zone & fishable range
usually
Surface
Film
Subsurface
Deep
Setup sensitivity: medium
Quick facts
Tying difficulty
Intermediate
Buy or tie?
Classic Adams Fly Tying Instructions by Charlie Craven
Charlie's Fly Box · canonical
Fulling Mill
Broad, stable commercial source for classic dries, wets, nymphs, lures and salmon flies.
Fish Fishing Flies
Large UK fly catalogue useful for broad pattern coverage and traditional alternatives.
Big Y Fly Co
Regional specialist (USA (Oregon))