Help On Kerr Lake Pre Spawn Bite

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Hopefully some of you can offer me some guidance. I am planning a trip to Kerr Lake next spring for a couple of weeks of fishing with an old friend. As I am traveling from Ohio, I would like to set the schedule to hit the aggressive pre-spawn Bass bite. Can anyone advise me, given average spring weather, when do the Bass & Crappie typically go into spawn on Kerr?

Thanks very much for any help and advise you can offer me....its a long drive and we would like to hedge our bets by pulling in during the best possible times.