Hello all. I fish a covered dock throughout most of the year. I have had decent success except for the past 3 months or so. Its like the crappie have just packed up and gone. I'll only catch 3-5 in about 3 hrs of sitting there while in the spring I'll catch 15-20 easily. The depth of water ranges from 18-30 ft and has a few pvc trees, some oak brush and a couple of pallet stake beds with vinyl hose attached to them.
The dock is not particularly close to the main creek channel (~200-300 yards out) but the depth range seems spot on. Is it just the time of year or do I need more structure? Small dynamite charge? Underwater neon sign?

I normally fish a standard minnow rig. #1 or #2 gold hook about 1ft below a split shot, minnow hooked through the back or head, 4 or 6# clear mono. I usually only get to fish in the evenings but when I do get a morning to go, the results are no different.

Any help would be appreciated.