I don't have a clue how many go through the dam. I can see where extreme cold and lethargic fish would go through. But on
those years the lower lake should be a hot spot and more often than not this doesn't seem to happen. The carp are in there,
does that play a role? Someone with research could probably come up with a more accurate answer than me riding by looking
through the windshield saying by God they need to do this or that.