State and local officials are required by the Federal Energy Regulatory Commission to test an emergency action plan.
The exercise simulated an imminent failure of the dam caused by an earthquake.
A collapse of the Oroville Dam could flood more than one million acres in eight Northern California counties.
Oroville Dam holds back Lake Oroville, the main reservoir of the state water project system.
When full, Oroville has enough water to supply about 40 percent of the state's urban water needs for a year.