Thanks for all the replies! This lake I'm referring to is not beaver made, it's a huge man made lake that surrounds much of a major city.

I was stoked to see a beaver there but confused because, obviously, i don't know a lot about them, and didn't know why they'd be in a lake, eating lily pads.

Well, turns out, they probably built some posh lodge because the sound of running water isn't triggering their rage inspired damming instinct!!

Edit: words