No name to the source. And the crater could have been caused by rushing water?
Actually, after the breech, the damaged portion of the levee was under water. It wouldn't have been possible to see a crater even one were there.
There is a report in the Wall Street Journal that one of the reasons for one of these breeches in the levee is because a large barge broke it open. That could be the crater that Loius is seeing.