The dam is damp about 1/3 of the way up and the water is running below the dam. It's also on the far side of the dam. I don't THINK it's causing a problem, but there is significant erosion downhill from the running water. It's definitely sloppy down there, as my tractor will rut it up pretty good if I try to mow through there.

If it is a spring, I'm going to have to do something about it, as it is really muddying up my neighbors land.

I figured that pond water filtered through the base of a wide dam (I'd say at least 50 feet) would be very similar to spring water. If you guys know otherwise, I'll readily believe you, as this is most certainly not my area of expertise.