This pattern has been pulling duty for me across most of my waters for several years now. I prefer it fished without weight, along with another heavy nymph or a split-shot.
BWO Nymph
Hook: #14-18 Standard 2XL Nymph
Thread: Olive Dun Uni-thread
Tail: Barred Lemon Wood Duck
Rib: Fine Gold Wire
Abdomen: Ginger Hareline
Thorax: Ginger Hareline
Legs: Barred Lemon Wood Duck
Wing-Case: Dun Turkey Flat (Coated with Bug Bond)
For full tying video click on the link below: