I have no idea what caused the leaks. The pond is about 12 years old. I have never seen muskrats beavers or anything. The pond is 100'x200' 12' at the deepest when full. There are no trees on the dam but there are some below it. The pond is stocked with catfish largemouth and has a ton of bull frogs, I also think there is a few grass carp in there. I did not stock I bought the property 2 yrs ago to eventually build a house on.