I saw the moonbow at Cumberland Falls, KY years ago when I was like 14. I was reminded of it in a conversation with my mom, and I had to google it to remember the location, but I had the state right. We were on a camping trip through Tennessee & Kentucky, and were in the right area at the right time of the month to stay and see it.
They say that you can hardly see the colors with the naked eye, but it was a clear night, with good water flow, and I could see it well with my young eyes. You had to sit in the dark for 10 or more minutes to let your eyes adjust enough to see it though.
Unfortunately, my cheap instamatic type camera back then couldn’t capture a photo, even though it had a time lapse setting I didn’t have a tripod so tried to hold it steady on a rock for 10, 20 and 30 second exposures I got nothing more than a ghostly blur.
I may take my son there someday, and use my programmable digital camera with a tripod to get pictures.