The Henry’s Fork has Green Drakes on it from Warm River to Fun Farm bridge, and the fish are starting to eat them. Also, there is a good spinner fall in the mornings, and then later in the evenings the fishing has been good with Caddis. A few golden stones are still around and can be used to catch fish out in the middle of the river behind rocks. If there seems to be no action on the surface, I would head to deep troughs and try your luck with nymphs.
Dry Flies: Rusty Biot Spinner size 16 & 18, Green Drake Wulff size 10, Improved-X Caddis Tan or Olive size 16, Super Chernobyl Golden Yellow size 10
Nymphs: Red Copper John size 16, Bennett’s Brown Rubber-leg size 8 & 10, Psycho Prince size 16, Pheasant Tail nymph size 16 & 18