Always running super cold,v and always very fishable, the Metolius River is a top choice now. Starting with a Bull Trout Report, suddenly there seem to be a lot of extra Bull’s in the river. My guess is many of the lake run fish have arrived before they spawn in the tributaries next month. (Remember, except for Lake Creek, none of the Metolius tributaries are open for fishing to protect spawning Bull Trout habitat year round). Large streamers (black, all white, gold/silver, black/purple) are picking up fish now.
Hatches are good some days and not great other days. On any given day you should see Golden Stones (8-10) Yellow Sally (16-18) PMD (16-18) BWO (20-22) Caddis (Olive 16-18, Tan 16-18)
In any given late July week, sometimes there is a lull in dry fly action, so this is a normal part of the cycle on the Metolius, and you could go tomorrow and have the best dry fly day of your life in the spot you picked too. We usually see a big improvement on this aspect of fishing there by Mid-August BTW.
Running heavy beaded nymphs on a Euro rig is producing a lot of good fishing. It is also not uncommon to catch Bull Trout this way, as well as Whitefish and Redband Trout.