Puu Opae Reservoir
Puu Opae Reservoir is an earth dam located in Kauai County, Hawaii, built in 1930. It carries a Low hazard potential classification and has a unsatisfactory condition assessment.
About Puu Opae Reservoir
The primary purpose of Puu Opae Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Hawaii Dept Of Hawaiian Home Lands (state). It impounds the Tr-nui Stream Offstream near Mana.
The dam stands 41 feet tall and stretches 1,625 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 295 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1930, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. An emergency action plan is in place for this dam. The most recent inspection on record was 11/21/2024.
At 41 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Hawaii |
| County | Kauai |
| Nearest City | Mana |
| River/Stream | Tr-nui Stream Offstream |
| Coordinates | 22.03903, -159.72361 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 1,625 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 295 acre-ft |
| Max Storage | 295 acre-ft |
| Normal Storage | 193 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Hawaii Dept of Hawaiian Home Lands |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Unsatisfactory |
| Last Inspection | 11/21/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | HI00003 |
| Federal ID | HI00003 |
| More Info | State Dam Safety Program |