re: Depths in Bayou Biloxi ?

Here are the furthest areas South I would go in Bayou Biloxi. On the first link is where they dock a 120 mothership for duck hunting. I wouldn't go another 3/4 mile beyond that though because it will get shallow the further you go East.

29°58'21.8"N 89°30'24.0"W
29.972709, -89.506659
LINK

You can anchor anywhere South of those two areas with a 4.5 ft draft with no issues at all.
E
Louisiana
29.954913, -89.521951
LINK