The Middle Deschutes will depend on where you go. Bend to Lower Bridge is pretty warm now. I’d mostly rest that water, but I do think it is possible to fish it early in the AM and the last hour before dark.
Steelhead Falls area is gaining springs and the flow of Whychus Creek too, and the water is rejuvenated through there. Float-n-Fool, PMD Sparkle Duns, X Caddis, BWO’s and smaller Stimulators are all worth fishing. There will be some good nymph options for those of you looking to extend your fishing beyond the hatch.