Hey bd,It can be narrowed down.They move up usually in nov. when the surface temp drops below 60 degrees.I've caught them shallow from then until the srface temp rises above 60.For the best numbers the fall thru turn over is best because the population is still within 5 or 6 miles from the dam.After turn over they scatter thru out the whole lake from one end to the other.Once the water temp. starts to rise in the spring they migrate to the lower end.Still the backs of the creeks all winter,like horse creek.I think you said you tried Dale Hollow branch,I've never really caught bows in there.I don't know why,it really does'nt make any sense,you think they'd be in there....