Answer: I wish I had an easy answer for you but storm damage and compacted soils can take a few years to show up on an otherwise healthy tree. I'm most concerned about the clumping foliage. This typically indicates herbicide damage. Since I can't visually inspect the tree, nor do I know the history of the flooding in the area, I really can't make a diagnosis. A very large old oak tree is certainly worth the effort to save so I'd recommend having a certified arborist make a visit and inspect the tree. Let's hope it pulls through!
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