CDC Blue Wing Olive 02/18/2026 Photo Album
For an early narrative on the origin of the CDC blue wing olive (CDC BWO) please refer to my post of 03/11/2014. I read it before writing this post, and it was a nice refresher.
This fly remains my go to choice, when I encounter a blue wing olive hatch in the spring and fall. It seems to work quite often, and it is a relatively easy fly to tie. I find that it functions best, if I can make a downstream cast. Of course, this involves staying low and out of the trout’s window, since they are looking upstream, and I am above them.
I tie these small flies primarily in size 20 and 22, although I have been known to produce a few 24’s. I tie in a small clump of CDC first in the same manner, as I create a comparadun wing. Next I move the thread rearward and create a tail made from two microfibbet tips. When I start the thread, I do not snip off the tag end, because I use it to pull back through the microfibbets to split the tails. As a last step, I dub a very fine noodle to form a tapered body and thorax.
This fly is normally the first one I choose during a hatch. However, there are occasions, particularly when it is windy (quite often the case during BWO hatches), when the fish totally ignore this fly. These instances are very frustrating. I have had some success with adding some hackle, wound Catskill style, behind and ahead of the CDC wing. I believe that baetis mayflies create a commotion fighting the wind to get airborne, and the trout key in on movement, and the addition of hackle conveys more motion.
I counted my CDC BWO’s of all sizes and determined that my inventory was adequate, so I approached the vise and produced five new versions with hackle collars in size 20. Hopefully these will fool trout during windy conditions, when the trout’s feeding habits become too finicky.

Nice View
Left Side
Five New Hackled Versions
Opposite Side
Materials
Olive Stimulator
Yellow Stimulator
Another Olive
Olive Deer Hair Caddis
Left Side Gray
Standing on Hackle Tips
Moose Mane Tail
Big Wing
Five for the Fly Box
Size 14 and 12
Different Angle
Finished Product
Opposite Side
Materials Included
Size 14 GD Comparadun
Nice Large Fan Wing – Trout Key on the Big Wing
Looking Closer
Right Side View
Nice Wing Angle
Five New Chubbys
Peacock Body
Ready to Float
Very Popular Fly