So last night I found this hole in my dam strictly by walking nearby and hearing the water running. Went back out before work this morning and took this video real quick. So far I can not locate the hole in the pond side of the dam

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I went down the backside of the dam last night and the hole is big enough I can fit my fist in it. I am guessing muskrats did this as I killed a pair a couple months ago but in the winter I am home very little during daylight hours and the pond had been down 18 or so due to our extremely dry fall here in IL. So with recent rainfalls the pond had come back up to pool but is really falling now with this. I suspect this hole is around a foot below full level.

So what in the world do I do to fix this?

I have a 2" siphon I can set back up to pull the pond down faster and not thru this hole over the weekend to hopefully stop the leak and possibly find the other end of the hole.

Appreciate any guidance on this.


My pond renovation thread here