The Lower Deschutes is a good bet upstream of Maupin to the Locked Gate. Lots of nymph opportunity through there. Stones, Jigs, Perdigons, Prince, Hares Ear, Bead Head Flashback PT, Sparkle Pupa, and Red Copper John.
Maybe a few BWO’s and small Caddis hatching, but at this time I wouldn’t get too excited for dry fly action quite yet. In 3 or 4 weeks the March Browns should be popping!