How about swimming areas in Eastern Maine-Augusta Area?

I will be driving through there in the next few days and i see all this water on the map. Are there any good lakes/rivers for swimming. And as a nod to the Old Orchard Beach lifeguards, by "swim" I mean go out "over my head" and move via stroking (and some kicking) for at least 1/2 mile in each direction...yes really... I don't mind if there are or aren't lifeguards (except when I have to help them "rescue" me from swimming in water over my head after I told them that was where i was going and they agreed...) I'm guessing there are not many open water swimmers in this state but if anyone passed thorugh and found a great place to swim...