Lower Kapahi Reservoir Reservoir Report
Last Updated: December 19, 2025
Lower Kapahi Reservoir, located in Kawaihau, Hawaii, is a vital water resource managed by the local government.
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Summary
The reservoir, completed in 1920, serves as a crucial offstream storage facility for the Kapaa Stream. It has a dam height of 20 feet and a storage capacity of 194 acre-feet, providing essential water supply for the region. Despite its historical significance, the reservoir is currently classified as having a high hazard potential and poor condition, highlighting the need for maintenance and potential upgrades to ensure its continued functionality.
The Lower Kapahi Reservoir is subject to state regulation and inspection by the Department of Land and Natural Resources. With a drainage area of 0.38 square miles and a maximum discharge capacity, the reservoir plays a key role in managing water resources in the region. However, its high risk assessment underscores the importance of proactive risk management measures and emergency preparedness. As a significant water infrastructure in Kauai, Hawaii, the reservoir's condition assessment and hazard potential are crucial factors for water resource and climate enthusiasts to monitor and address for sustainable water management in the area.
As climate change continues to impact water resources globally, the Lower Kapahi Reservoir stands as a critical asset for water supply and management in Kawaihau. The reservoir's high risk potential highlights the importance of ongoing monitoring, maintenance, and improvements to ensure its resilience in the face of changing climatic conditions. By staying informed and engaged with the state's regulatory agencies and local government, water resource and climate enthusiasts can contribute to the sustainable management of the Lower Kapahi Reservoir and help safeguard this essential water infrastructure for future generations.
Year Completed |
1920 |
Dam Length |
650 |
Dam Height |
20 |
River Or Stream |
TR-KAPAA STREAM OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Drainage Area |
0.38 |
Nid Storage |
194 |
Structural Height |
24 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Left Branch Opaekaa Str Nr Kapaa
|
2cfs |
Eb Of Nf Wailua River Nr Lihue
|
39cfs |
Sf Wailua River Nr Lihue
|
173cfs |
Halaulani Str At Alt 400 Ft Nr Kilauea
|
13cfs |
Hanalei River Nr Hanalei
|
258cfs |
Wainiha River Nr Hanalei
|
178cfs |
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 |
|---|---|---|
Lydgate Beach Park Camping
|
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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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Hanamaulu Beach Park - Kauai
|
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Niumalu Park - Kauai
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Lower Kapahi Reservoir