Green drakes and small light pale morning duns hatching in size 18s. So much stuff on the Middle it doesn't matter what you fish with lately. A size 14 yellowish elk hair stimulator is tough to beat. Prince nymphs are a good green drake nymph. Go about seven miles up the dirt road.
Caddis casings indicate a looming strong hatch.
Green drakes are active in the Pinnacles area. The 50-mile stretch From Green River, Wyo. to the Fontanelle Dam is seeing good fish activity, particularly in the wildlife refuge waters. Mostly a golden stone hatch. Fish with a small size 14 Yellow Sally or Blond Wolf. Woolly Buggers and bead head nymphs are productive.