One of my good producers is a comparadun - 20 to 22, olive, gray, brown. Try tying it with orange poly for the comparadun wing. A must have for baetis is the RS-2, 20-22 in gray, iron gray, or brown or olive. BWO patterns run the gamut, rather than being one certain pattern. But don't be without your midges. They're talking of closing the park, including the river, on Christmas Eve, so keep track of that.