I had answered this on the Tn. website where I first saw the question, but I thought I would put it on here, too.

Years ago Rayo Breckinridge had a fishing show on the Jonesboro tv station. On one trip he was crappie fishing on the Miss. River, and I believe it was around Blytheville. I know it was somewhere in Crittenden County. He tore up the crappie fishing minnows under corks behind dikes or wing dams. He said on the show that when the river was at 5 ft. or below on the Memphis gauge and was stable or falling slowly that he did well in the slack water behing dikes, wing dams and sand bars. As I recall he was fishing in the really hot part of the summer.

I can't say that my memory is that great, but I wrote some notes on a Crittenden County map I had.