I loved back packing in the Sierra Nevadas when I lived in California. Florence Lake has a clamshell type dam. It was completely empty one winter so I took a walk under and along the dam. you could literally scratch the concrete away with your fingernail. I don’t think that’s a good sign. I imagine all the concrete dams in California are that way. Who needs dams when you’ll never have rain again and you need a 100 billion dollar bullet train between Shafter and Bakersfield.
I would say that if you live in a flood-prone location downstream from this dam then consider getting out of harm’s way for the next 3-4 days as there is a ton of rain coming in tonight, tomorrow and Tuesday. If the system can hold up against this one, then there will probably be time to manage things back to a good place, but I wouldn’t stick around for the next three days, especially if I could afford to go on a side trip. If this dam is going to go, it would be Tuesday or earlier.