The macks and Kamloops have been hammered pretty hard with the bounty they had on them. Believe it or not, there is a growing population of walleye in that lake that are caught up by the PO river outlet and the CF river mouth. Spawn is over, so they won't be concentrated, but they might be worth dragging some gear for.
FWIW, I do know the guys that are still catching rainbows in the lake are dragging flies and Apex's off of planer boards at daybreak and dusk. It is my understanding that these fish are very, very boat shy.
Good luck!