Have you talked to the neighbor about the pond? Find out what their pond management views are. Perhaps the neighbor would want to participate in a management plan that would benefit both of you.

I assuming that when you purchased the property you knew the pond was on shared property. Have you thought about buying that piece of property from the neighbor?

I think all and all property or water rights questions should be answered by an attorney that practices in this area of law in Arkansas.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)