Yep - it's true.
The beavers have dammed up French Creek, resulting in a new big beaver pond and a 2' high waterfall over their new dam. If you know the course, this is on the 3rd hole. Doesn't affect the play, but the new pond makes a walking trail along the creek impassable. (Honestly, the sound of the running water over the waterfall is a pretty nice touch)
You can trap these guys legally, but it really shows how mother nature can quickly change a golf course in the dead of winter.
What other examples (other than the obvious storm-related damage) can you think of that shows how mother nature can quietly and quickly change a golf course?