Kapaia Reservoir Reservoir Report
Nearby: Aii Reservoir Aahoaka Reservoir
Last Updated: February 5, 2026
Located in Kapaia, Hawaii, the Kapaia Reservoir serves as a vital resource for irrigation purposes, drawing water from the Hanamaulu Stream.
Summary
Completed in 1910, this private-owned reservoir boasts an impressive dam height of 50 feet and a storage capacity of 1114 acre-feet. With a surface area of 54.4 acres and a drainage area of 2.51 square miles, Kapaia Reservoir plays a crucial role in supporting agricultural activities in the region.
Despite its historical significance and functional importance, the Kapaia Reservoir is facing challenges in terms of its condition assessment, which has been reported as poor. The reservoir has a high hazard potential, prompting the need for regular inspections and maintenance. The last inspection in 2018 revealed the reservoir's deteriorating state, highlighting the urgency for improved risk management measures to ensure the safety and sustainability of this essential water source. With its moderate risk assessment rating, stakeholders and authorities are urged to take proactive steps to address the reservoir's current condition and mitigate potential hazards.
As water resource and climate enthusiasts, the Kapaia Reservoir presents both a glimpse into Hawaii's rich history of water management and a pressing issue in terms of infrastructure maintenance and risk management. With its strategic location in Kauai County and its role in supporting local agriculture, the reservoir serves as a reminder of the delicate balance between human needs and environmental stewardship. As discussions continue on how to address the reservoir's deteriorating condition and implement effective risk management strategies, it is crucial for all stakeholders to prioritize the sustainability and preservation of this valuable water resource for future generations.
°F
°F
mph
Wind
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Humidity
15-Day Weather Outlook
Year Completed |
1910 |
Dam Length |
1050 |
Dam Height |
50 |
River Or Stream |
HANAMAULU STREAM |
Primary Dam Type |
Earth |
Surface Area |
54.4 |
Hydraulic Height |
45 |
Drainage Area |
2.51 |
Nid Storage |
1114 |
Structural Height |
53 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
53 |
Seasonal Comparison
5-Day Hourly Forecast Detail
Nearby Streamflow Levels
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
| Location | Reservations | Toilets |
|---|---|---|
Hanamaulu Beach Park - Kauai
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Lydgate Beach Park Camping
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Niumalu Park - Kauai
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Kumu camp
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Anahola Beach Park - Kauai
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Anahola Beach Park Camping
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Kapaia Reservoir