JHFV......I live between Waxahachie and Midlothian and had my dock re-built last year. The young man who did the job set the poles in about 4 to 6 feet of water (at the time). He sharpened the ends of 4 x 4's with a chain saw, pounded them as far as they would go and set them in 5 gal. buckets of concrete. He would probably be glad to help you. If you contact me @ 972-937-6623, I will be glad to pass along his name and number.