Twin Reservoirs
Key Takeaway
Twin Reservoirs is classified as high hazard in Hawaii. It was completed in 1920 and is 106 years old. Its primary use is other. 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 | 49 ft (taller than 81.9% in HI) |
| Dam Length | 1,810 ft |
| Dam Type | Earth |
| Max Storage | 520 acre-ft |
| Normal Storage | 162 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,800 cfs |
| Year Completed | 1920 (106 years old) |
| NID ID | HI00062 |
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
County of Kauai - Department of Public Works, Green Aloha Real Estate, LLC, Kapaa 382, Kulana Home Owners Association, Leonard Kaui, Matthew Goodale, Troy & Renee Johnston, Twin Lakes, Waipouli Manoa, LLC
Local Government
Nearby Dams
Lower Kapahi Reservoir
Kauai, HI
High Hazard 20 ftMimino Reservoir
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High Hazard 44 ftHalaula Reservoir
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High Hazard 26 ftPond No. 1 At Kauai Ranch
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High Hazard 32 ftField 1 Kealia Reservoir
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High Hazard 29 ftKaneha Reservoir
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High Hazard 46 ftWailua Reservoir
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High Hazard 40 ftUpper Anahola Reservoir
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Low Hazard 27 ftFrequently Asked Questions
What is the hazard classification of Twin Reservoirs?
Twin Reservoirs 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 Twin Reservoirs?
Twin Reservoirs is owned by County of Kauai - Department of Public Works, Green Aloha Real Estate, LLC, Kapaa 382, Kulana Home Owners Association, Leonard Kaui, Matthew Goodale, Troy & Renee Johnston, Twin Lakes, Waipouli Manoa, LLC (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Twin Reservoirs built?
Twin Reservoirs was completed in 1920, making it 106 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 Twin Reservoirs?
Twin Reservoirs serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Twin Reservoirs?
Twin Reservoirs has a dam height of 49 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 Twin Reservoirs last inspected?
Twin Reservoirs was last inspected on October 14, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.