Opinion to follow:
I think the discharge does help the bite in spring and fall to some extent. If I recall correctly, the plant can’t discharge water more than 5 degrees above the main rivers temp.
I know that when I fish around the discharge, watching my temps of the sonar there’s hardly a notable change.
In talking with Mrs. Everts, she was saying that before the dam, they drove their trucks to the other side of the river as she pointed to the MN shore line across from the resort.
I do believe the dam has more to do with open water than the little warm water coming from the discharge.
I don’t believe the plant has hurt the fishing/bite and may have helped it on the upper end of P-4…at least from my armchair.