Umpqua May Day BWO

May Day is a pared‑back mayfly pattern built for clear water, slow pools and fussy trout. It sits low in the surface film, rides neatly on the hackle and tails, and shows a slim, natural silhouette that matches both BWO and PMD hatches. The sparse wing keeps it easy to see without spooking wary fish, which helps when casting fine tippet on technical rivers.

Choose the BWO versions when olives are coming off on overcast days, and the PMD versions for the lighter mayfly hatches in warmer, clearer conditions. Sizes 17 and 19 cover most modern European mayfly situations where trout have seen plenty of flies and presentation matters more than bulk. A solid choice whenever rising fish refuse more traditional patterns.

• Pattern: Mayfly imitation for BWO and PMD hatches
• Available variants: BWO 17, BWO 19, PMD 17, PMD 19
• Presentation: Low-riding in the surface film
• Use: Selective trout and grayling in clear or pressured waters
• Ideal conditions: Slow runs, pools and technical dry fly fishing