Maunaolu Reservoir
Key Takeaway
Maunaolu Reservoir is classified as high hazard in Hawaii. It was completed in 1966 and is 60 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 | 27 ft (taller than 29.9% in HI) |
| Dam Length | 800 ft |
| Dam Type | Earth |
| Max Storage | 23 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 2 acres |
| Year Completed | 1966 (60 years old) |
| Year Modified | 2014 |
| NID ID | HI00149 |
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
Honolulu Board of Water Supply
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Maunaolu Reservoir?
Maunaolu 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 Maunaolu Reservoir?
Maunaolu Reservoir is owned by Honolulu Board of Water Supply (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Maunaolu Reservoir built?
Maunaolu Reservoir was completed in 1966, making it 60 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 Maunaolu Reservoir?
Maunaolu 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 Maunaolu Reservoir?
Maunaolu Reservoir has a dam height of 27 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 Maunaolu Reservoir last inspected?
Maunaolu Reservoir was last inspected on March 11, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.