Pull up to the lock, wait for the lockmaster to tell you when to enter. The lock master can be reached via your marine radio also. I suggest asking them if many barges are planning to enter the locks. Sometimes this can be hours of waiting before they let you in.
If you lock thru i fish just up around the point out of the locks to the right in the current from the dam and pick up quite a few smallies bouncing bottom some days they hit with the bait going witht current and other days they hit when you pull you bait against the current . on your way to the locks fish the edge of the warm water discharge out where the water is forming the small eddies it should start to get good there again with the air temps cooling off and the water dropping a few degrees but still being warmer than the rest of the river good Luck and leave some fish for me.