Flood Control Dams in Hawaii
Hawaii has 11 flood control dams, of which 11 carry a high hazard classification. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate.
| # | Dam | County | Height (ft) | Hazard | Condition | Year |
|---|---|---|---|---|---|---|
| 1 | Kaneohe Dam | Honolulu | 83 | High | Fair | 1980 |
| 2 | Nuuanu Dam No. 4 | Honolulu | 73 | High | Fair | 1910 |
| 3 | Kahana Nui Dam | Maui | 58 | High | Poor | 1984 |
| 4 | Honokowai - Structure #8 | Maui | 50 | High | Fair | 1995 |
| 5 | Napili 2-3 Desilting Basin | Maui | 43 | High | Fair | 1988 |
| 6 | Nuuanu Reservoir No. 1 | Honolulu | 34 | High | Poor | 1905 |
| 7 | Kaopala Basin | Maui | 30 | High | Fair | 1998 |
| 8 | Kehalani Offsite Retention Basin | Maui | 30 | High | Poor | 2003 |
| 9 | Napili 4-5 Desilting Basin | Maui | 18 | High | Fair | 1985 |
| 10 | Happy Valley Flood Prevention | Maui | 18 | High | Not Rated | 1980 |
| 11 | Puukapu Watershed Retarding Dam R-1 | Hawaii | 12 | High | Fair | 1965 |