The Metolius is open in all sections now and the upper river is good for Euro Nymphing and some good PMD and Caddis hatches. The PMD’s and Green Drakes in the Middle and Lower River are getting better and better and we are not even to June with regards to hitting the best 2 1/2 to 3 weeks of the Drakes. 
I am heading to the Metolius today for 4 days of camping and fishing. We bought a travel trailer last November for just such an occasion, and these next 2 weekends are for Drakes and Camp Fires with friends. Hope to search for a few Morel Mushrooms too. 
I talked to a couple of friends on the river this week who caught nice Bull Trout. One of them was on a small olive Perdigon nymph! How about that! 
Caddis are going to be going crazy with the upcoming warm weather. Pupa and Adults will be important.