he sunk to 6x6 treated posts 10 foot in the ground and concreted them in and had poured some concrete to shore up the sides so the posts would NEVER get washed out. this was before i got the call.
build a fence off from 2 posts. this one is the smaller of the two. 6 ft tall, 6ft 3 inches wide. (creek flooded and i couldnt hang the second one...yet)