Hi Scubatim,
As mentioned above, there are lots of farm ponds (known in Texas as "Tanks"), but the problem is that in Texas much of the land is leased for hunting and fishing. This is especially the case near the high population areas. In some parts, farmers and ranchers make almost as much leasing the land for hunting as they do from farming.
Of couse you never know until you ask.
Regards,
Gandolf