Maui Reservoir 84 Reservoir Report

Last Updated: December 20, 2025

Maui Reservoir 84, also known as Hc&S Reservoir 84, is a private water storage facility located in Puunene, Maui, Hawaii.


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Summary

Built in 1918, this Earth-type dam stands at a height of 29 feet and has a storage capacity of 120 acre-feet. The reservoir primarily serves the purpose of irrigation and is fed by an irrigation ditch, making it a crucial resource for sustaining agriculture in the region.

Despite its historical significance and vital role in supporting local agriculture, Maui Reservoir 84 faces challenges related to its condition assessment, with a poor rating and a high hazard potential. The last inspection in August 2020 revealed the need for improvements and maintenance to ensure the safety and reliability of the structure. With a moderate risk assessment rating, there is a pressing need for proactive risk management measures to mitigate potential hazards and ensure the long-term functionality of this essential water resource.

As a key component of the water infrastructure in Maui, stakeholders and regulatory agencies, including the DLNR, play a crucial role in overseeing the operations, inspections, and enforcement related to Maui Reservoir 84. With its strategic location and historical significance, this reservoir serves as a reminder of the ongoing challenges and responsibilities associated with managing water resources in the context of climate change and increasing demands for sustainable water management practices in Hawaii.

Year Completed

1918

Dam Length

960

Dam Height

29

River Or Stream

FED BY IRRIGATION DITCH

Primary Dam Type

Earth

Surface Area

8

Hydraulic Height

23

Drainage Area

0.57

Nid Storage

120

Structural Height

23

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

29
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.