The Lower Deschutes is going to be a great bet this week for both Trout and Steelhead. The Warm Springs to Trout Creek drift is good for trout and so far just a few Steelhead are showing up that high in the system. But give it 2 or 3 weeks up there and the steelhead will filter in quite nicely for fall. 
For now we are enjoying some good trout days on Pale Evening Duns and PED Spinners and a lot of Tan Caddis #16 and 18. Absolutely get Iris, Corn Fed, X and Fin Fetcher’s to match the hatch and get a few Dead Bug Caddis to fool the trout sipping on spent egg layers tomorrow morning. 😉 Certainly bring #14 and #16 Purple Haze too. 
Nymph action has been good with Tungsten PT’s, 2 Bit Hookers, Caddis Pupa, Girdle Bugs, Brown Jig Napoleon and Red Copper John’s. Some of the FFP guides have also had recent success with Jig Streamers like a Slump Buster, Mini Gulp and Squirrel Jig. 
Most of the best steelhead catches are still happening below Maupin. As September progresses more fish will be throughout the entire 100 miles of the Lower Deschutes, but for now, if your focus is swinging flies for steelhead, get down to the Pine Tree to Beavertail and Macks Canyon drifts, or Macks to the Mouth. Green Butt Skunk and Freight Train, Peacock & Purple and Anderson Euphoria’s. Right now the best luck is on floating lines and I don’t think you need a sink tip for a while yet. (October is coming)