Son, you have picked a "sleeper" lake that can be on at times & deader'n a doornail at times. It's the lake I started my fishing adventures on, back in the late 50's, but is nothing like it was back then ... due in large part to the decay & loss of a lot of the standing timber of yesteryear. I can't say about the Winter months fishing, as I've not Crappie fished it in decades, and even when I did it was Spring-Fall for me.
I can say that, yes ... the Crappie will bite during the Winter months, but what I can't say is how deep you'd have to fish. The lake is just about at normal Winter Pool (~725) so finding a place to launch may be a problem. (Summer Pool is ~745)

Last bit of info on Winter fishing I got from a friend of mine was that he caught them casting a pop-eye jig into open boat slips. And I believe I remember him saying that he was fishing the slips at Herrington Marina. Now, that was many years ago, but would still be relevant info, nowadays.