More things to worry about at Oroville Dam:

Oroville Dam is also at seismic risk

Also, apparently they were warned years ago about the inadequacies of the "Emergency Spillway".

The government was warned that the Oroville Dam emergency spillway was unsafe. It didn’t listen.
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"Toto, I've a feeling we're not in Kansas any more."
-Dorothy, in The Wizard of Oz