Grew up fishing that river. There is always a big group a fish houses near the beach where the two rivers meet. You’re better off going up the red a ways and try to find a spot where the current is still and you might have some luck. Ice was always pretty good up there, but with any river be careful. I’ve caught some pretty nice Red Lake walleyes out of that river and would slam northerns and crappies in the spring. Never had fast and furious fishing in the winter, but if your stuck in Thief its worth it. Like I said before, getting in some slower moving water will help a lot. Good Luck!