On my home lake it is different...our 2500 acre water retention Reservoir is Fertile and heavily stained, with no natural cover left, and very little structure except for humps, creekbeds, ponds, foundations, and a couple trestles.
We have been getting Heavy rains throughout the past couple years and fishermen are lost...
When muddy conditions occur, the Crappie head for 2 places...either shallow water coves or breaks where the waves are crashing, it is alittle clearer, and oxygen levels are way higher....or to areas where we added BIG COVER, so they can back up against it and feel protected.
So we still just cast to them....I use 20lb gray Seaguar smackdown, hyper snap/swivel, and a 1/16oz jighead for shallow water, and a 1/8 oz jig head with 1/0 red sickle for deeper cover.
The key to catching Crappie here is with Contrasting colors, Sound, Vibration, and scent....Chartreuse is one of the first colors to put away because it Mutes and Blends in our water. When the sun is high or when it is cloudy are the best times. Black and White, Red and White, etc, are good cloudy day colors...But my best all around and go to lure is a Black and Blue with silver sparkle Keitech Easy Shiner 3" swimbait...if it's still not getting their attention, you can pare it with a horsehead spinner, beetle spin, small buzzbait, etc. Smell also comes into play, so you can add a Nibblet, waxworm, Slab Sauce, etc.