Paul,
If I were making the decision, I would be heavily weighted toward a no go decision unless you plan to live 24/7 on the property. My experience with absentee pond ownership shows that it is very difficult, no impossible to control the pond unless it is within your boundaries and you are there on-site. Locals that may have become accustomed to using "your" pond will likely continue to do so, in spite of your best efforts. If you are okay with that up front and okay with not being able to manage your pond, then all other things being okay, go for it.
