The Lower Deschutes is really getting good for Steelhead, and it is nice to see fish all the way up to the Warm Spring to Trout Creek area. While most of the Steelhead remain farther downstream, they are quickly infiltrating all 100 miles of the Lower River creating equal chances of catching one on any drifts you choose to take. 
As for the trout action, it is a little slower now. Some days they are active in the usual spots, and fishing will be great. There is a transitional time on the river in the Fall when we need the Summer weather to end and the real Fall weather to begin to stack the odd on the big river back in our favor on a more consistent basis. Do not let this deter you from a Lower D trout day. It doesn’t suck, you might need to be more creative and work harder for your fish. And nymphing with a Peacock Girdle Bug as your point, adding a dropper of a Brown TJ Hooker, Red Wiggle Worm, Oct Caddis Pupa, Tan Caddis Pupa, PT, Prince, Orange Psycho Prince, Lighting Bug or Rainbow Warrior will be good under the indicator. 
Euro Nymphing Perdigons and other Euro Jigs including small Streamers is something we love to do and puts us in touch with the fish more as well. 
As for the Steelhead, a lot of fish have been coming to the swung wet flies (Euphoria, Freight Train, Green Butt Skunk….) on a dry line. Get that while you can, because the shift to Skagit lines, Sink Tips and leeches is not too far down the calendar.
Book your October and November trips now. The calendar is really full the 1st 2 weeks of Oct, but opens up some after that. We would love to find a date to get you out mining for Steel.