I was in the small town of Piru, CA on Saturday, and was told that there is a siren system installed to warn of dam failure. The resident told me that the siren(s) are to the West of where she lives on Main St at the rairoad tracks. I drove around a little, and couldn't find one. I also tried on Live.Local, but my screen is too small to help. On a google search, I found several official papers that prove there are sirens there, but no locations given. One paper says they test them every other Friday, but I also read that they're tested once a month (perhaps a change happened in time)...
If anyone has a bigger display, and wants to do a project search, please post if you can find any of the sirens
Charles