Anyone can dig a hole but will it hold water. I live in Sutherland springs tx not far from you. I don't think you relize how much work it is digging a pond out. I think you will be happier if you hire a expert. I hired a guy with a d5 dozer with a 6 way blade and ripper used a transit laser used all the soil didn't haul anything off made a nice dam and spill way that goes around the dam and holds water good.i can give you his name and number he advertises in tghe Wilson county paper

Cry me a river