What they said, at about 50 some will move at times very shallow to the very back ends of some creeks but they move in and out allot.
One thing I've really learned this winter is to target the more active fish higher in the water column over deeper water. As a rule crappie will move up in the water column before moving back into the creeks.
I've been catching crappie all winter from 6 to 12 feet deep over 20 to 30+ fow.