The only thing I can think of is that maybe the lake was emptied when Charley passed through it and then when the back side of it came back in? But I don't know if that would happen in a lake. I know they said that all the water would be pushed out of the mouth of Tampa Bay and then back in, but that's a bay, not a lake.
Another explanation might be some kind of contamination of the lake that could have nothing to do with Charley.
-------------------- You know you're a hurricane freak when you wake up in the morning and hit "REFRESH" on CFHC instead of the Snooze Button.