I know that's the case with Oroville, and apologize that I should have been more clear. Oroville's failure was due to the spillway construction design and possibly, substandard materials used. The bigger point is that there are lots of dams out there designed with a data record of 20 - 30 years in a pre-climate change environment from which the 100, 500, or 1000 year recurrence interval events for which the dams were designed were based. In the era of climate change the recurrence interval floods may be substantially underestimated. This is in a addition to the fact much of that infrastructure is aging and may be worn out.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse