Here is the fly pattern sheet for the BWO Mayfly Cripple.

BWO Mayfly Cripple |



Daiichi 1100 or 1180 #16 – 22


8/0 olive dun


Zelon – mayfly brown


Superfine dubbing – gray/olive


EP Trigger Point Fibers – light or medium dun


Light or medium dun


  1. Attach thread to hook behind hook eye and wind backwards about halfway.
  2. Tie in Zelon and hold upwards and on top of hook while continuing to wrap thread just past hook bend.
  3. Add dubbing to thread and wind forward until 2/3 point.
  4. Tie in wing material, allowing materials to extend over hook eye. Wrap tightly as materials are slick. Cut rear section and leave small tuft.
  5. Tie in hackle. Place 3 wraps behind wing and lift wing material up and place 2 wraps in front. Tie off hackle and cut excess.
  6. Whip finish.
  7. Trim tail 2/3 body length.
  8. To trim wing, pull wing back and trim at end of body.
  9. Trim hackle bottom even with hook point to allow low profile in water.

Learn more about Blue Wing Olives in my post – Blue Wing Olives.

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