The Baetis (aka Blue Winged Olive) hatch is in full swing on the Yellowstone and is likely getting started on the other rivers and streams as well. The snow, rain, clouds and cooler temps as of late are just what the doctor ordered. It’s been fantastic out there. Parachute Adams, H&L Variant, Baetis Sparkle Dun, Royal Wulff Cripple, Purple Haze and many others are good choices in size #16. If the visibility is tough simply rig a #16 soft hackle Pheasant Tail about 16″ under a large dry such as a chubby which will serve as an edible strike indicator.