Ive often wondered this but thought I would ask the pro's. LOL! Anyways, wouldnt you think that flatheads would hang out around the warm water discharges throughout the winter?? I would sure think they would like that better than 38 degrees. The water temp does vary though, sometimes it is downright hot and other days it is just warm but ive always thought it was a common sense that they would like that type of area. Thing is I have fished our warm water discharge area a ton and have never caught one in the winter. Wonder why, there seems to always be shad in that area and every other type of fish species in the winter.