Was this the event CNN has been broadcasting since early morning? Looked like a barge with a crane / some soft of floating platform that had broken from its mooring and was buffeted against the pier, didn't look like there was much danger of it going further downstream, looked pretty wedged in with the current.
In Mobile an Oil Drilling Platform has struck the US-98 bridge. The HWY is closed until they can assess damage to the bridge. They also said they have no idea where the Oil Rig came from.