Oroville is a concrete and bedrock dam. It is not an earthen (soft earth and rock) structure and is not in danger of failing. There is concern for a 320ft long section of concrete that acts as an uncontrolled spillway when the lake level gets about 900 feet, and worst case scenario would be like a 30ft dam failing.
ONLY that portion is in danger.
Ah. That is because the spillway is ABOVE the dam itself?
>>> Oroville is a concrete and bedrock dam. <<<
Where did you get your information?
Wiki has it as a concrete encased earthen dam:
https://en.wikipedia.org/wiki/Oroville_Dam
==
Oroville Dam is an earthfill embankment dam on the Feather River east of the city of Oroville, California, in the United States. At 770 feet (230 m) high, it is the tallest dam in the U.S.[7] and serves mainly for water supply, hydroelectricity generation and flood control.