Dry fly
American March Brown
Big mottled riffle dun
Trout · GraylingSurface
Large mottled-wing eastern US dun of late-spring riffles; a robust upright-wing dry.
Fish this when
During the late-spring March Brown hatch on eastern US riffles, when the big mottled duns are riding the broken water in numbers.
Why it works
Its large mottled wing and robust build match a natural that's genuinely one of the biggest duns of the season, worth a fish breaking cover for.
Naturals it imitates
Typical zone & fishable range
usually
Surface
Film
Subsurface
Deep
Setup sensitivity: medium
Quick facts
Tying difficulty
Intermediate
Heritage
ModernClassicHeritage
Classic
· USA, codified 1947 — Art Flick, building on Preston Jennings' 1935 cataloguing; American reapplication of the older British March Brown name
Buy or tie?