Kaloko Reservoir
Kaloko Reservoir is an earth dam located in Kauai County, Hawaii, built in 1890. It carries a High hazard potential classification and has a poor condition assessment.
About Kaloko Reservoir
The primary purpose of Kaloko Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Kaloko Llc, Ko'olau Kula Llc (private). It impounds the Koloko Ditch near Kilauea.
The dam stands 46 feet tall and stretches 915 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 147 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1890, 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 02/25/2025.
At 46 feet, this dam is taller than 91% 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 | Kilauea |
| River/Stream | Koloko Ditch |
| Coordinates | 22.17813, -159.37977 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 46 ft |
| Dam Height | 27 ft |
| Dam Length | 915 ft |
| Year Completed | 1890 (136 years old) |
Storage & Hydraulics
| NID Storage | 147 acre-ft |
| Max Storage | 147 acre-ft |
| Normal Storage | 122 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Kaloko LLC, Ko'olau Kula LLC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 02/25/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | HI00030 |
| Federal ID | HI00030 |
| More Info | State Dam Safety Program |