I can attest to the big browns that FRG is talking about. I used to fish with one friend who really liked to fish the river between the Lava Lands Visitor Center (I think that's what it's called, on Hwy97 between Bend and Sunriver) and up past Sunriver resort a ways. I have caught some browns around 20" and have seen some that were way bigger. We used to use floating or neutral Rapalas in rainbow trout pattern. I think these were the 3" version. Cast upstream and rip them back down along undercut banks and others sources of cover. Don't be afraid of a real fast retrieve.