Northwest TX likely has huge swings in pond levels based on dry conditions. I think this makes fencing off cattle very difficult, and it probably amplifies the effect cattle have on water quality. Plus in there are ponds I'm guessing the acreage is in the thousands and the cattle operation is pretty big, not something the average guy can work with. But, if you have multiple ponds in the same pasture maybe you can fence one off and make a project out of it? Fence is more of a suggestion to cattle than a barrier. If they want through it they will get there. We have cattle and 6 ponds total. We have good fishing but each pond is different and has it's own personality.