Maui Reservoir 33 Reservoir Report
Nearby: Maui Reservoir 30 Maui Reservoir 42
Last Updated: December 19, 2025
Maui Reservoir 33, also known as Hc&S Reservoir 33, is a private water storage facility located in Pukalani, Maui, Hawaii.
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Summary
This reservoir plays a crucial role in irrigation, serving as a primary source of water for agricultural purposes. Completed in 1910, this Earth dam stands at a height of 30 feet and has a storage capacity of 167 acre-feet, with a normal storage level of 143 acre-feet.
With a high hazard potential and fair condition assessment, Maui Reservoir 33 is regularly inspected by the appropriate state regulatory agency, DLNR, to ensure its safety and efficiency. The reservoir features an uncontrolled spillway and serves as a vital water resource for the surrounding area. Despite its age, this reservoir continues to play a significant role in supporting the local agricultural community and maintaining water security in the region.
Water resource and climate enthusiasts will find Maui Reservoir 33 to be a fascinating example of early 20th-century water infrastructure in Hawaii. As a key component of the irrigation system in Maui, this reservoir demonstrates the importance of proper maintenance and regulation in ensuring the continued availability of water resources for agricultural activities. Its historical significance, combined with its ongoing operational relevance, makes Maui Reservoir 33 a compelling subject for further study and appreciation in the context of water management and climate resilience efforts.
Year Completed |
1910 |
Dam Length |
1240 |
Dam Height |
30 |
River Or Stream |
FED BY IRRIGATION DITCH |
Primary Dam Type |
Earth |
Surface Area |
8 |
Hydraulic Height |
24 |
Drainage Area |
0.02 |
Nid Storage |
167 |
Structural Height |
35 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
35 |
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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