Thanks for tune up, esshup. Back during my pond -101 days, MR was part of the introductory course. It included their burrowing and den characteristics. Some time ago, a couple of threads got fired up on the forum, but I don't recall that the subject matter came along far enough to seriously consider eradication. Assuming this is what I am faced with, I might be joining Fat McB in extending the varmint learning curve.
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So...let's say we are sure that there are MR at the pond. I'm absentee and only make day trips. There is nobody nearby (neighbor) that is going to volunteer do visual checks, much less help eradicate. My first thought is to take a couple of hours and walk the shoreline with a #6 rebar and jam it into the bank next to the waterline every foot or so to find cavities (where's a dentist when ya really need him?). If I find an obvious subterranean hideout, go out into the water, find the entrance, and set a conibear. Make sense?
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WRT the dam, I am always concerned, but the substantial dam mass we constructed and high clay content lessens my concern for a breach. Of course, the damage at any point within the pond bothers me.