The Oroville Dam's spillways are near failure, spurring an evacuation order for 100k+ on Sunday afternoon.
Currently, water's below emergency levels and there's opportunity for repair work but in a few days, they're due to get a lot more rain!
Picture below, the dam and the spillway.
Here's two recent photos of the spillway's deterioration:
There's also the emergency spillway which is damaged. It's basically just the hillside further to the left:
Photo of evacuee:
Here's hoping this is the worst of it
Edit:. I should probably add that there was fear of imminent collapse earlier but we lucked out there