if u ask me cleveland has the best beaver exhibit in the usa. still trying to find some over seas but all those are euro beavers. something to look into for another day.
ya cleveland's beaver exhibit is nice. there in with the mexican gray wolves and alot of freshwater stream fish. and across the way is the bald eagle. very natural looking exhibit. But you might also wanna keep checking on this but Detroit zoo is supposly building a new michigan wetlands and beaver exhibit for 2012 mainly looking to get done round fall sometime. I can see them have a nice beaver exhibit and also looking forward to seeing how the national zoo's new american section turns out with the beaver exhibit.
Except for the pinniped exhibits, the other enclosures in beaver valley are not getting renovated/rebuilt - just the valley's pathway is being rebuilt due to infrastructure construction.