Try a Pheasant Tail,Hare,s Ear or Caddis Nymphs with a sinkink tip line. Maybe a wet fly as an attractor or strike indicator such as Orange Fish Hawk,Royal Coachman,or Cambell' s Fancy. Being in the River with snow on the banks is the way to go. Cuts down on the crowds also. Remember if your not Bumpping the Bottom your not in the strike zone.