Thanks, GLTirebiter and fellow posters for your thoughts and concern.
GL: The info provided in the link above -- "gizmodo" -- indicates that nearly 70% of US dams are privately owned and, often, avoid strict surveillance. What dams were once categorized as low-hazard structures have become high-hazard dams. They are old and many, many have failed, resulting in loss of life; in some instances, owners have been charged with manslaughter.