Shrubs:
Silky dogwood, buttonbush, elderberry, possibly chokeberry.
Trees:
Mulberry, Pin oak, shingle oak, swamp white oak, shumard oak (maybe depending on how far north you are).
What is growing on the bottom ground already? I'd try those above and they can take a higher moisture content, but not much will grow in shade very well...cept some of those shrubs I listed.
If silver maples are what you have, they may have shaded out everything else and not be an indicator as to what will really grow there. My creek bottom floods quite a bit, but the water goes up and comes down fast. Its nodaway silt and fairly well drained. Walnut, ash, swamp white oak, honey locust, shingle oak, shumard oak, cherrybark oak, elderberry, chokecherry, chokecherry, elderberry, hazelnut, mulberry and a host of others are thriving there even tho is floods occasionally.
Its really going to depend on how quickly the water goes up and comes down for those species I listed.