Horner Reservoir
Key Takeaway
Horner Reservoir is classified as high hazard in Hawaii. It was completed in 1926 and is 100 years old. Its primary use is irrigation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 70 ft (taller than 93.7% in HI) |
| Dam Length | 1,100 ft |
| Dam Type | Earth |
| Max Storage | 88 acre-ft |
| Normal Storage | 71 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 34 cfs |
| Year Completed | 1926 (100 years old) |
| NID ID | HI00054 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Kaanapali Land Management Corp.
Private
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What is the hazard classification of Horner Reservoir?
Horner Reservoir is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Horner Reservoir?
Horner Reservoir is owned by Kaanapali Land Management Corp. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Horner Reservoir built?
Horner Reservoir was completed in 1926, making it 100 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Horner Reservoir?
Horner Reservoir serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Horner Reservoir?
Horner Reservoir has a dam height of 70 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Horner Reservoir last inspected?
Horner Reservoir was last inspected on April 1, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.