pre-spawn on reservoir lakes, I always found crappie in staging areas at the front of coves near structure, at least the larger females. spider rigging was always my preferred method. For walleyes, we are in post spawn in Colorado now and walleyes are still schooled in deeper water in coves. 19-29' was best for me in close proximity to the shallow flats in the coves. Also gentle sloping flats up the lake were good prespawn. leeches on lindy rigs are working best here for walleye and is usually the go to so as long the water isn't to cold where the leech wraps around the hook.