The overall springtime hatch is ongoing and moving up the river. With good weather predicted for several days ahead, it is time to put together fly box contents for this time of year. The big stoneflies are pretty much out of the lower river except for the goldens. So for those adult goldens here and the upper river, patterns we suggest are Rollin golden and CFO golden olive in size 8-10. For the big stoneflies now in the Box and Coffeepot, try CFO Big Hair and improved or traditional sofa pillow in sizes 4-6. For the afternoon caddis hatch anywhere on the river, the Henry’s Fork caddis, X-caddis, and Lawson’s EZ caddis, all in size 14-18 are good bets. For isoperla stoneflies patterns anywhere on the river try CFO-X and yellow stimulator, both in size 12-16.
Any day now the drakes, followed by flavs, will begin working their way emerging up the river. For green drakes, try the D&D cripple, Harrop’s spinner, and Williams flex wing, all in size 10. For the gray drakes, try McLellan’s gray in size 10. For flavs consider the biot spinner, CDC emerger and cripple, all in size 14. Be sure to include the partridge and olive soft hackle which is as good an emerger pattern for both mayflies and caddisflies as any created. Nymph patterns, you ask? Bead head prince and pheasant tail in size 12-16 and rubber legs in size 6-10.