It's amazing that anyone can catch a fish in water as muddy as Lake Decatur is now. Not unheard of - it happens with regularity in water muddier than this. Bass adapt to feed in whatever the conditions they find themselves.
But we tend to picture things in human terms. That's a long explanation for why I whipped out the redneck Secchi disk again - this time in the form of a merthiolate-colored plastic worm - hunter orange, in other words.
The verdict, as verified on a fish-measuring board, four inches exactly. That's the distance from the surface that the bright orange worm completely disappeared from sight.
When the water's this muddy in Arkansas, we say, "You can see coon tracks on it."