to LisaMarie65 -- SW parts of Lafayette, close to water such as the Vermillion River, may have some flooding even though we are talking about 30 mi inland; The Pearl River flooded well inland of Bay St Louis, affecting towns and areas 10 mi upriver in MS with a surge that completely submerged the first floor of homes, trapping people in attics. The topography of southern LA coast is such that the surge could have effects pretty far inland. Even at this late hour, is there any safe evacuation route/destination that you would consider leaving for, right now? If evac is not possible now, and if you are in a vulnerable area, please take some precautions for possible flooding.

Flooding from storm surge is especially going to be a concern for any areas that are closer to bays and inlets such as from Crowley westward, even if they pretty far north from the coast.

to jmk818 -- actually a large portion of the central "finger" of Plaquemines Parish -- that is, of just the part of that parish that juts out into the Gulf -- was almost certainly completely underwater during a great deal of the time Katrina passed over. I believe waves were able to travel without obstruction across the inundated marsh and bayou, to batter the flooded towns bordering the MS River, in addition to the storm surge.

Here is a NOAA image of the type of havoc that storm surge and possibly waves on top of the surge did in one of these towns:

http://ngs.woc.noaa.gov/storms/katrina/24729709.jpg

Zoom in to see the detailed image by holding your cursor over the image, and then clicking on the box with arrows that appears in the lower RH corner.