could be by a drive way of some sort... doesnt have to be a highway.
FWIW- The e-mail I got last night said "on the side of the highway by the Morganza Spillway" according to the mystery photographer herself....That would lead one to believe LA 1- and that is not LA 1....
Tell you what, though..I could see where that thing could provide a serious amount of crawfish bait. All you'd need is a good cane knife!