It all started here: Dramatic video captured break at Oroville Dam spillway as concrete chunks sent flying

In February 2017, Oroville Dam's main and emergency spillways were significantly damaged, eventually prompting the evacuation of more than 180,000 people living downstream along the Feather River. The beginning of the crisis was caught early on in this citizen's video. Along with the water, chunks of concrete can be seen flying around the 18-second mark.
Beth Bello elfenvine YouTube channel