On the Metolius today and for the next few days I would expect to see amazing mayfly hatches. Blue Wing Olives, Cinygmula’s, Pale Morning Duns & March Browns all could/should be in the mix, and with the cool, cloudy and occasionally wet weather it is screaming MAYFLY HATCH!
Caddis prefer generally to hatch on warmer days, so they may slow down a little until mid week when the 70 degree weather returns. Certainly you can still be fishing caddis pupa patterns in the afternoon and evening times when the fish are used to seeing pupas in the drift and getting ready for emergence.
Stonefly nymphs are a great choice all over the river, with Golden Stones #8-14 being important year round on the Metolius. The smaller sizes are a good match for 1st year Golden’s, and also ringers for matching Yellow Sally Nymphs.
Bull Trout are eating well, everything from Nymphs, Leeches and Big Meaty Streamers.