Going from past exrience the walleye bite is only going to increase until mid summer. It will slow up towards the dam. This will be from the fish leaveing the area and heading to there normal summer patterns. There will still be fish up at the dam year long but the fish that are there now may have come from as far away as pool 6. Keep in mind that there will be a period of time that the eyes and saugers will shut down right after spawn, due to the energy they had displace. Threre will be fish to be caught. For not all fish spawn at the same time. But during a certain period of time. So talk to the bait stores, people at the boat landings, and of course right here for up to the minute info.
Good luck