Years ago I highlighted this fly on my blog as a sure fire way to bring trout UP during the Summer months. It got a very good response as fly fishers told the tales of good catches throughout New England while casting into the riffles and even pools with this creation. It still works as I took trout tonight on the Millers. It has the reputation as a riffle/pocket fly BUT it does well in calm sections of the river that you will fish. It will imitate caddis/stoneflies and land based insects that tumble into the water but it seems to work best in heavier currents because of its construction.
Hook - size 12 to 16 standard dry fly hook
Body - Gray works good and bright yellow seems to work better
Hackle - Any darker hackle from the rear to lighter hackle up front
Wing - Very fine deer hair tied straight up
The Bivisible name comes from two different colored hackles palmered in with the lighter up front. I've used darker up front and a lighter color throughout the mid and rear of the fly with good results. I've even taken a sharpie to color sections of the hackles and that worked too. Sometimes I've use the same color hackle for the whole fly. Color aside, it's a high floater with good visibility that looks like a living insect, stream born or terrestrial.
Note - don't crowd the hackles as you wind them in. Keep them sparse. It will float better. Use the dry "shake" powder and not the liquids or gels and stay away from the powder that comes with a brush. I'll explain that later.
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This weekend - Fish the Swift whenever you can but fish the others at dusk. That's when the action starts!!!!