Haiku Reservoir Reservoir Report
Nearby: Pauwela Reservoir Maui Reservoir 14
Last Updated: December 20, 2025
Haiku Reservoir, located in the picturesque city of Haiku on the island of Maui, Hawaii, is a privately owned water storage facility primarily used for irrigation purposes.
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Summary
Built in 1904, this Earth-type dam stands at a height of 37 feet, with a hydraulic height of 34 feet and a structural height of 43 feet. With a storage capacity of 266 acre-feet, the reservoir covers a surface area of 27.3 acres and serves as a vital resource for sustaining agricultural activities in the region.
Despite its historical significance and functional importance, Haiku Reservoir has been assessed as having a high hazard potential and an unsatisfactory condition. The dam's last inspection in December 2018 revealed areas of concern, prompting a moderate risk assessment rating. While the reservoir is state-regulated and subject to regular inspections and enforcement, there are no associated structures or spillway modifications listed, indicating a need for potential upgrades or risk management measures to ensure the safety and reliability of this essential water resource for the community.
In an era of increasing climate variability and water resource challenges, Haiku Reservoir stands as a critical infrastructure supporting agricultural sustainability in Maui. As water resource and climate enthusiasts, it is vital to monitor the condition and safety of such reservoirs to ensure their continued function and resilience in the face of changing environmental conditions. By recognizing the importance of Haiku Reservoir and advocating for necessary improvements, we can help safeguard this valuable water source for future generations.
Year Completed |
1904 |
Dam Length |
1700 |
Dam Height |
37 |
River Or Stream |
KANEMOEALA GULCH OFFSTREAM |
Primary Dam Type |
Earth |
Surface Area |
27.3 |
Hydraulic Height |
34 |
Drainage Area |
0.82 |
Nid Storage |
266 |
Structural Height |
43 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
43 |
Seasonal Comparison
Weather Forecast
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.
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Haiku Reservoir