Same rumors around Hartwell Damn.Truth.
There used to be trout in Lake Lanier, and people would fish deep for them at night near the dam.
The first time I heard about the "Volkswagon Size" catfish was about 1963. Supposedly the night fishermen could see them swimming around under their boats. Supposedly, the COE couldn't get divers to work around the dam because they were afraid of those fish.
I don't know how many people I knew ( a lot) who swore that the tales about the car sized catfish were true.