I caught a few this year.
I also caught a 7lb LMB out of our smallest tank (second tank).

The second tank is always the most full because it is spring fed.
The first tank has dried up to ~.5 acres?
I caught a 5lb LMB in the first tank but I've always had more luck in the second.
As for levels... The second is always the most full. During a "flood" the second will flow pretty heavily into the third but there's about a 20 foot drop to the third tank.