Kahakapao Reservoirs Reservoir Report

Last Updated: December 19, 2025

Kahakapao Reservoirs, located in Makawao, Maui, Hawaii, serve as a critical water supply source for the local government.


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Summary

Built in 1990, these Earth-type dams stand at a height of 54 feet and have a storage capacity of 309 acre-feet. Despite their importance, the reservoirs are currently in poor condition, with a high hazard potential, according to a recent assessment.

The reservoirs cover a surface area of 13.6 acres and have a drainage area of 0.02 square miles. The uncontrolled spillway is 3 feet wide, and the last inspection in April 2019 revealed the need for improvement. With a risk assessment rating of moderate (3), there is a clear need for increased attention and maintenance to ensure the safety and reliability of the Kahakapao Reservoirs for the community and surrounding area.

As water resource and climate enthusiasts, it is essential to monitor and advocate for the proper upkeep and management of Kahakapao Reservoirs. By addressing the poor condition and high hazard potential through regular inspections, maintenance, and risk management measures, we can help safeguard this vital water supply infrastructure in Maui, Hawaii. Let's work together to protect and preserve this valuable resource for current and future generations.

Year Completed

1990

Dam Length

2000

Dam Height

54

Primary Dam Type

Earth

Surface Area

13.6

Drainage Area

0.02

Nid Storage

309

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

54
       
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.