Thank you for that history lesson!! Never knew that..
It’s still a threat they take seriously. Here’s one same dam. The NCIC Files cops use to check for wanted and possible terrorist were down so the officer could not make a determination until later that morning. I know this area well. No one goes up there at 5:00am to take pictures. They cross it that time of morning because US 441 crosses on the top of the dam. http://www.freerepublic.com/focus/f-news/856962/posts