Dams in Hawaii
Dam Safety in Hawaii
Hawaii has 4 dams tracked in the National Inventory of Dams. Of these, 3 (75%) are classified as high hazard — meaning failure would probably cause loss of human life — and 0 are classified as significant hazard. Currently, 3 dams in the state have a condition assessment of poor or unsatisfactory, indicating recognized safety deficiencies.
The average dam in Hawaii is 91 years old. Many of these aging structures were built before modern dam safety standards were established, which increases the importance of regular inspections and maintenance. The most common purpose for dams in Hawaii is other, accounting for 2 of the state's dams.
Use the search above to find dams near any address in Hawaii, or browse by county below. Each dam listing includes its hazard potential classification, condition assessment, physical characteristics, and inspection history from the NID.
Hawaii Dam Facts
| Total Dams | 4 |
| High Hazard Dams | 3 |
| Average Dam Age | 91 years |
| Tallest Dam | 90 ft |
| Largest Reservoir | 970 acre-ft |
| Poor/Unsatisfactory Condition | 3 |
Notable Dams in Hawaii
High Hazard Dams in Hawaii
| Dam | County | Height | Condition | Purpose |
|---|---|---|---|---|
| Ku Tree Reservoir | Honolulu | 90 ft | Unsatisfactory | Other |
| Omao Reservoir | Kauai | 32 ft | Unsatisfactory | Irrigation |
| Happy Valley Flood Prevention | Maui | 18 ft | Not Rated | Flood Risk Reduction |