http://sonris-www.dnr.state.la.us/gi...TemplateID=381
Here is the Office of State Lands website GIS viewer that lists what is State owned water bottoms. I'm no attorney, but every time I do any development on the water, the Office of State Lands claims ownership of the water bottom once we get to -1.0 M.S.L., so someone would have a tough time proving you are trespassing in 3' of water while fishing. Now if you anchor, that is a different story.