Olinda Reservoir Reservoir Report

Last Updated: December 19, 2025

Olinda Reservoir, located in Maui, Hawaii, is a crucial water supply source for the local community in Haleakala Homesteads.


°F

°F

mph

Wind

%

Humidity

Summary

Built in 1918, this earth dam stands at a height of 42 feet and has a storage capacity of 26.6 million gallons. Despite its importance, the reservoir is currently rated with a high hazard potential and poor condition assessment, indicating the need for urgent maintenance and improvements to ensure its continued functionality.

Managed by the state regulatory agency DLNR, the reservoir is subject to regular inspections and enforcement to maintain safety standards. However, its high risk assessment level underscores the need for swift action to address any potential hazards or vulnerabilities. With a history of servicing the surrounding area with essential water resources, Olinda Reservoir stands as a reminder of the delicate balance between water supply infrastructure and the impacts of climate change.

As water resource and climate enthusiasts, the data on Olinda Reservoir serves as a call to action to prioritize investments in infrastructure resilience and sustainability. By addressing the identified risks and implementing necessary management measures, this vital water supply source can continue to support the community while adapting to the evolving challenges posed by a changing climate. The future of Olinda Reservoir hinges on proactive measures to ensure its safety, reliability, and long-term viability for generations to come.

Year Completed

1918

Dam Length

220

Dam Height

42

River Or Stream

KAILUA GULCH OFFSTREAM

Primary Dam Type

Earth

Surface Area

1

Hydraulic Height

41

Nid Storage

26.6

Structural Height

42

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

42
       
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.