Must be a different willow species.
On Google Earth, coordinates 29 41 15N, 91 23 14W will put you on the pond I'm talking about. At the top of the page, clicking on the clock icon with the counterclockwise arrow will show the pond as it was in years past as well as the present day image. Many of the willows at the middle of the pond were totally submerged, while the trees along the northerly, easterly and southerly pond edges were not. All died except for a few along the southerly edge which I cut and sprayed.

The lone tree that I mentioned can be seen near the southwest corner of the south pond in the 2005 image.

In the 2012 image and between the ponds is my truck. That enviably handsome guy to the right rear of the truck is me planting a tree. Yes, I know, I know, but that truly isn't Burt Reynolds. It's really me.