Thanks guys. We want to keep the standpipe out further in the water because it will be located fairly close to a road and there will be less chance of tampering or vandalism if it's far enough out that it can't be reached from shore. We'll try some angle iron braces and maybe some rock piled around the bottom to help stabilize it. I'll post some pics once we get the work underway. We are extremely wet here this summer so it'll probably be later in the fall before we get to work on this project.