Can you find a map with one of the main (whatever you call it) for the levees at 17th and Canal?
I am SO not familiar with levee terms!
hold on... I'll see what I can do
http://www.easternuswx.com/bb/index.php?showtopic=48087&view=findpost&p=568248
It's in the NW part of the image, near the red building, and bridge.