The Middle Deschutes is good fishing from Tumalo to Lake Billy Chinook,. and this area is still seeing Pale Evening Duns, PMD’s, Tan Caddis and add Mahogany Duns and BWO’s to the mix. 
The best fishing is with your Euro Nymph rig with Perdigons and Jigs and 2 Bit Hookers. 
Don’t forget some Jig Streamers and Sculpins.