Napili 4-5 Desilting Basin
Key Takeaway
Napili 4-5 Desilting Basin is classified as high hazard in Hawaii. It was completed in 1985 and is 41 years old. Its primary use is flood risk reduction. 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 | 14 ft (taller than 3.1% in HI) |
| Dam Length | 270 ft |
| Dam Type | Earth |
| Max Storage | 25 acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,600 cfs |
| Year Completed | 1985 (41 years old) |
| NID ID | HI00127 |
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
Maui County, Dept of Public Works
Local Government
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High Hazard 35 ftFrequently Asked Questions
What is the hazard classification of Napili 4-5 Desilting Basin?
Napili 4-5 Desilting Basin 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 Napili 4-5 Desilting Basin?
Napili 4-5 Desilting Basin is owned by Maui County, Dept of Public Works (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Napili 4-5 Desilting Basin built?
Napili 4-5 Desilting Basin was completed in 1985, making it 41 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 Napili 4-5 Desilting Basin?
Napili 4-5 Desilting Basin serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Napili 4-5 Desilting Basin?
Napili 4-5 Desilting Basin has a dam height of 14 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 Napili 4-5 Desilting Basin last inspected?
Napili 4-5 Desilting Basin was last inspected on July 19, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.