Cf, I would really use my electronics to try and find the shad close to flooed buck brush. I would also stay with normal pool brush piles, just slow down and try a 1/8 oz to 1/4oz jig head. What lake are you fishing? you may try trolling jigs or slower spider rigging to cover water until you establish a pattern and then pin point them vertically over the top of the shad/ crappie. High water is very tuff, but i wish you the best of luck and tight lines.