The water temps are going down, so there should be some fish in the river and upper lakes by then. The flow going up would be a big deal. If the flow is up a bit, you should be able to find fish near the bridges (especially the ones farther downstream, near the main lake). The 41 bridge is usually a good spot for the start of the cooler weather.
I’d also troll Butte Des Mortes for a mix of eyes and whites. Troll from the first big cane bed in the middle of the lake, north east along the can line. There should be some fish in that stretch. #5 shad raps 13-25′ behind the boards. Try both bright and natural colors. I’d start with Hot Tiger on one rod, and baby Walleye on for sure.
If the water goes up a good amount, you may even find some fish in the cane beds. I’d stick to Butte and the river from there down for now.
Good Luck