The South end of Toledo Bend does not get real dirty and definitely not dirty for long periods of time. If more people fished out their regional areas more often the definition of what dirty/muddy, cold, high flow water looked like would be much more consistent.
Thinking that 2 foot high water causes a massive grass (Hydrilla, Milfoil, Coontail, Pondweed) kill at anytime of the year is very hard to believe. There are lakes and river systems that fluctuate much more and have high current flows throughout the country.
The Toledo Bend lake level may have not have had many instances of being over full pool in the past twenty years but it still fluctuated regularly.
Something else helped kill the grass(es). Whether it was due to natural cycles, virus, herbicides, Martians - I don't know....
I was down there this March when the entire lake, including the south end, turned to chocolate milk. That part is correct but the grass was already gone in most spots I fished. I can't help but wonder if there was some spraying for the sylvania that killed the hydrilla.