I have a pattern for you. I've fished it for years and years. Everyone that fished it came back to order more. Tied it in three olive green shades. Its simple and so effective.
Hook, 6 3xl, body olive green chenille [tied well past the shanks back] from light to dark shades. Hackle, two turns pheasant rump feather. [ The feathers at the end of the rump.] Keep the hackle barbules few on ea side -pick out some hackles . Say five or so on ea side. Get it wet and make sure the fly is upright. not on its side when you strip it in. Strip in soft short jerks. or can be trolled. The body can be tied fat in the first part of the year then slim its body as the season progresses. lighten up the color of body as season goes on, but all colors fish during the season. If I don't get hits I'll change colors and check to see if it is upright. Let me know how you do. Its called the dragon fly nymph. Origin WA
I fish it for trout, browns, triploids.