Originally Posted by cab
Barr Emerger, RS2, Pheasant tail. Sometimes a black RS2 seems to work.(?)
A BHPT (natural) like pictured above works well for Mayfly hatches of all sorts, IMO.
A PT anything can work on nearly any mayfly hatch. Another very simple fly to to try is a floating PT nymph. All you need is a little something in the thorax to keep the fly in the film - tying in a little hump of foam is the easiest, but you can use poly yarn or CDC. It can be that simple or you can embellish with a tail/shuck, a very sparse turn or two of parachute hackle. I like to add a wire rib with a couple extra turns at the butt to be sure it hangs down in the water.
You know the golden rule of when you want a fly to sink it won't break the surface. Usually happens with cripple patterns that have too much stuff sticking off the front over the eye, it tips the fly forward and then they are not doing what they were supposed to do. Weight the butt.
I digress, a floating nymph will kill. Give a try.