High Risk Dams in the United States

There are 2,631 high hazard dams in the United States with a condition assessment of poor or unsatisfactory. These are dams where failure would probably cause loss of life, and where recognized safety deficiencies have been identified.

A "poor" condition means a safety deficiency is recognized under normal operating conditions and remedial action is necessary. "Unsatisfactory", the worst rating, means the dam is considered unsafe and the deficiency requires immediate or emergency action. Combined with a high hazard classification, these dams represent the most pressing dam safety concerns in the country.

Of the 16,265 high hazard dams nationwide, 2,631 (16%) have a condition rating of poor or unsatisfactory.