So I am back to believing that the muskrats are to blame. As the water level has went down it has become very apparent I have a serious muskrat problem at this point. I have found 4 areas that look similar to this entrance in the dam in different spots around the pond. This entrance is probably 10ft out of alignment with the hole in the back of the dam, I am guessing they got greedy with a new addition and popped thru the backside...

The entrance is directly under my siphon pipe and notice all the runs leading out in to the pond. I just picked up a new pair of traps to put out.

[Linked Image]

My pond renovation thread here