Interesting thing about muskrats....I believe that they have some inherent sense that when they dig their dens, they don't allow the water to drain out of the pond, at least intentionally.
Thats pretty much correct, the problem is, when there is a slight drought and the water level is a ft low, they will dig new ones at the lower elevation, then bingo, when the water comes back up to full pool you have a hole that's draining your pond down to that elevation.
My neighbor lost a really expensive Tennessee walker show horse stud, he was running across the pond dam and stepped down thru the muskrat hollow and broke his leg.
