One of the ferries used on the Lower Algiers-Chalmette route across the Mississippi River broke free of its mooring during the hurricane, drifted up the river, and then ran aground. One of the sections of the Gulf Outlet Dam was overtopped by the storm surge. The USGS recorded the Mississippi River near Belle Chase flowing in reverse due to the volume of the surge. The St. Stephen Catholic School in New Orleans lost its roof.
