February 2017 saw one of the most serious dam-related engineering incidents in history with the failure of the service spillway at Oroville Dam. Whether they realized it or not, the people living and working downstream of Oroville Dam put their trust in the engineers, operators, and regulators to keep them safe and sound against disaster. In this case, that trust was broken. Practical Engineering provides a summary of the event, including an explanation of the engineering details behind the failure.