90% of my crappie fishing on OH is shooting docks, I've spider rigged with about every kind of bait there is with poor results. I've trolled crank baits with the same results as well. Docks in the 10 to 14 depth range are the best right now. Steam plant is during the winter months, not summer months, the discharge water during the winter is warmer and it will attract bait and the fish eating the bait. Hope this helps.
Good luck,
Ray