Piwai Reservoir
Piwai Reservoir is an earth dam located in Kauai County, Hawaii, built in 1916. It carries a High hazard potential classification and has a poor condition assessment.
About Piwai Reservoir
The primary purpose of Piwai Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Alexander & Baldwin, Inc. (private). It impounds the Poelelele Stream near Omao Homesteads.
The dam stands 56 feet tall and stretches 535 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 261 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1916, the structure is over a century old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 05/06/2025.
At 56 feet, this dam is taller than 94% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Hawaii dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Hawaii |
| County | Kauai |
| Nearest City | Omao Homesteads |
| River/Stream | Poelelele Stream |
| Coordinates | 21.93275, -159.49040 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 56 ft |
| Dam Height | 56 ft |
| Dam Length | 535 ft |
| Year Completed | 1916 (110 years old) |
Storage & Hydraulics
| NID Storage | 261 acre-ft |
| Max Storage | 261 acre-ft |
| Normal Storage | 222 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 480 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Alexander & Baldwin, Inc. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 05/06/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | HI00114 |
| Federal ID | HI00114 |
| More Info | State Dam Safety Program |