I lived in Bend, OR many years ago and use to fish the Deschutes where it entered the lake and the drowned creek channel.
Dragon fly and damsel fly nymphs worked best.
There's some damn big fish in that lake.
I've only fished it once (2 days). All of my success came on minnow patterns. It's a huge, gorgeous lake, with huge, gorgeous trout. Biggest trout I've ever caught was outta there. Plenty of other lakes in the area worth fishing, not to mention the Deschutes too. Bend area is awesome!