The Lower Deschutes is winding down fast on big stones, and based on the report I just got from the end of the 3 day trip it was very good fishing, but thank god for nymphs. Even the caddis were in retreat for whatever reason, but the bite was very good on a variety of small nymphs including caddis pupa, perdigons, 2 bit hookers, PT’s and frenchies. 
Typically this time of year as the salmon flies and golden stones dwindle the summer caddis get stronger, and pale evening duns can occur anytime of the day but usually by namesake prefer the evening hatch period, and pale morning duns like afternoons and evenings too. 
One thing to also consider more and more on the Lower Deschutes we are incorporating small streamers to the daily game. Dead drifting some, and swinging others will produce good results. Squirrel leeches, sculpzilla, slum lord and mini gulp’s are good streamers for the D in any stretch where trout live.