At the end of Two Towers we saw the waters of the Isen rush into Isengard. I am not sure if this happens in the book as well.
Regardless of that, would the waters eventually recede, or do you think there would now be a permanent lake at Isengard?
I need to know what the lay of that would be like in the 4th Age.
Do you think gondor would have reclaimed it as a stronghold, or left it abandoned?