The Lower Deschutes has made the jump from Salmonflies and Goldenstones (you’ll find a few left) to Pale Evening Duns, Pale Morning Duns and a lot of Tan Caddis. 
This is now my favorite time of the year for the Deschutes, especially evening dry fly fishing. 
Throughout the day you will find some dry fly fishing, but expect to nymph, either Euro style or with an indicator. BWO Nymphs, Perdigons, Caddis Pupa, Soft Hackle PT’s, Micro Mayflies, 2 Bits for BWO’s and PMD’s, Red Ass Soft Hackle, Flashback PT are all hot flies for the sub surface game.