Engineering Division, Dam Safety

The condition of the dam is evaluated using four categories, based on definitions from the National Inventory of Dams.  These evaluations come from detailed inspections called Phase 1 Inspections.  If something major changes between Phase 1 inspections the dam’s rating may be updated to reflect its current condition. The four condition classifications are defined as follows:

• SATISFACTORY – No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the applicable regulatory criteria or tolerable risk guidelines. 
• FAIR – No existing dam safety deficiencies are recognized for normal loading conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
• POOR – A dam safety deficiency is recognized for loading conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Further investigations and studies are necessary.
• UNSATISFACTORY – A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.

Condition Assessment of Regulated Dams in Hawaii

Most of the regulated dams in Hawaii are either in Poor or Unsatisfactory condition. This is partly a reflection of the average age of Hawaii dams as well as changes in national standards to increase dam safety.

Interact with the map below to better understand the condition of Hawaii’s dams.