I took a closer look at the neighbor's pastures, and found the source of the pond's water. There is a little stream that runs down the hillside and into the old creek bed. It should not be too difficult to pipe that over to a trough for livestock.
There is a lot of wildlife back in there. Yesterday I got a close look at a blue heron in the pond, and tonight I conversed with a screech owl. It called to me, and I whistled the song back. I tried to get a picture, since it was sitting just above me, but it was too dark to turn out very well. After lightening the photo, you can kind of see the owl in the middle of the picture.