"California negligently failed to make preparations for the inevitable end to a major drought which had been occurring since 2011.

For 12 years, environmental groups had warned federal and state officials that the dam was likely to experience structural issues in the event of heavy rains and flooding. Reports are surfacing that the large pothole which has lead to the failure of the Oroville dam spillway was known to the state government since 2013.

Governor Jerry Brown had years to direct the Democrat controlled state government to authorize funding and enact plans for repairs to the dam while water levels remained low. The Water Quality, Supply, and Infrastructure Improvement Act of 2014 set aside $395,000,000 for flood management, but to date has not allocated any of it to actual repairs or projects, raising questions about where the money currently sits and what it has been used for since 2014."

From zero hedge report; link post not allowed.

So whose fault is it if the State of California is negligent in not providing using funds it has set aside to correct this problem?

I am guessing that the funds were diverted to support of illegal alien programs.