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I don't sink any brush piles but I do like crappie fishing in the summertime... Normally for me, between 10 and 15 feet seem to hold fish fairly consistently in the lake where I spend a good bit of my fishing time... Most crappie fishermen seem to quit after the spring spawn but I seem to be able to catch crappie all summer long although they do seem to be smaller... I would think you would need to keep the brush above the thermocline which here seems to be around 20 feet give or take a foot or so.... Crappie are actually easier for me to pattern in the summer after they have spawned and returned to the deeper cover... I guess most of the time I am fishing somebody else's brush pile that I have managed to find... Good luck.