You can get on schools of smallies on Champlain, Erie, and Ontario and bang out dozens of fish over 4 pounds. I know I have done a few days of 30 smallies over 4 pounds.
Largemouth, my record is 26 while goofing around / prefishing one day on Champlain. It was actually for the Weekend Series T I won on smallies. All the fish came on jigs and spinnerbaits. Had 9 over 5 and 5 over 6. Had nothing left for thumbs.
Champlain is just one of those special places.