Waikoloi Reservoir Reservoir Report
Nearby: Kaawanui Reservoir Kepani Reservoir
Last Updated: December 19, 2025
Waikoloi Reservoir, located in Kaawanui Village, Hawaii, is a privately owned structure primarily used for irrigation purposes.
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Summary
Completed in 1958, this earth dam stands at a height of 64 feet and has a storage capacity of 147 acre-feet, providing essential water resources for the surrounding area. The reservoir is situated along the Waikoloi Stream and covers a surface area of 5.2 acres, serving as a vital source of water for agricultural activities in the region.
Managed by the DLNR and regulated by the state of Hawaii, Waikoloi Reservoir has a fair condition assessment with a high hazard potential. With a moderate risk level, the dam undergoes inspections every 5 years to ensure its structural integrity and safety. Although the reservoir has an uncontrolled spillway type, its operations and maintenance are closely monitored to mitigate any potential risks or emergencies. Despite its age, Waikoloi Reservoir continues to play a crucial role in water resource management and climate adaptation efforts in the area.
For water resource and climate enthusiasts, Waikoloi Reservoir offers a fascinating example of how man-made structures can support sustainable irrigation practices and contribute to local agriculture. As a key feature in the landscape of Kauai, Hawaii, this reservoir serves as a reminder of the importance of water management in the face of changing climate conditions. By understanding and preserving structures like Waikoloi Reservoir, we can ensure a reliable water supply for future generations and enhance our resilience to the challenges posed by a warming world.
Year Completed |
1958 |
Dam Length |
505 |
Dam Height |
64 |
River Or Stream |
WAIKOLOI STREAM |
Primary Dam Type |
Earth |
Surface Area |
5.2 |
Hydraulic Height |
44 |
Drainage Area |
0.09 |
Nid Storage |
147 |
Structural Height |
50 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
64 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Waimea River Nr Waimea
|
295cfs |
Waialae Str At Alt 3
|
34cfs |
Kawaikoi Stream Nr Waimea
|
30cfs |
Wainiha River Nr Hanalei
|
178cfs |
Eb Of Nf Wailua River Nr Lihue
|
39cfs |
Sf Wailua River Nr Lihue
|
173cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
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|---|---|---|
Lucy Wright Beach Park - Kauai
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Salt Pond Beach - Kauai
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Wiliwili Camp
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Kaluahaulu
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Waialae
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Hipalau
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Waikoloi Reservoir