CZ
Good luck, it looks like you have done all the prep work you have time for, I feel for those that are not so lucky. Once a dam is overtopped or a breach starts you can't stop it, there is just too much power behind it. It doesn't matter what you build, water is the most important single thing to worry about. Every dam should have a spillway, at a lower elevation than the top of the dam, to guard against overtopping. They still have to be inspected on a regular basis to give time for repair work to prevent breaches. Once a dam gives way, it will usually overcome the spillways of lower lakes. Always build your house on high ground.
Mike
