Probably depends on water clarity...Ozarks tends to be fairly clear, at least in the lower 2/3 of the lake. Crappies will nest deeper in clear water than in murky water.

Crappies love a slowly-moved fly that is above them.

I've been using 1/80th oz microjigs under an indicator year-round (except for icefishing, of course) for crappies in my area. Adjust the distance between the microjig and the indicator to suit the depth you need. If the fish are in water greater than 5' or so, you may choose to use a heavier microjig under a larger indicator, so that it sinks to depth quickly.

Another technique that works well at times is swimming Crappie Candy flies or beadhead Woolly Buggers through spawning areas. Chartreuse is often the best color, but occasionally something else works better.

Good luck and post pictures of your trip for us!