Elima Reservoir Reservoir Report

Last Updated: December 19, 2025

Elima Reservoir, also known as No.


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Summary

5 Reservoir, is a privately owned water resource located in Kalaheo, Hawaii. Built in 1901, this earth dam stands at 38 feet high and spans 700 feet in length, with a storage capacity of 126 acre-feet for irrigation purposes. Situated on the KALAHEO GULCH, this reservoir covers 10.1 acres and serves as a vital source of water for the surrounding area.

Despite its historical significance, Elima Reservoir faces challenges in terms of its structural integrity, as it has been rated as having a poor condition assessment and a high hazard potential. The last inspection in February 2020 highlighted the need for improvements to ensure its safe operation. With a moderate risk rating, there is a call for increased risk management measures to mitigate potential hazards and ensure the continued functionality of this essential water infrastructure in Kauai, Hawaii.

As a key part of the local irrigation network, Elima Reservoir plays a crucial role in supporting agriculture in the region. With its uncontrolled spillway and limited storage capacity, there is a pressing need for ongoing maintenance and upgrades to enhance its resilience to climate change impacts. The involvement of the State of Hawaii Department of Land and Natural Resources in permitting, inspection, and enforcement underscores the importance of proper management and regulation to safeguard this valuable water resource for future generations.

Year Completed

1901

Dam Length

700

Dam Height

38

River Or Stream

KALAHEO GULCH

Primary Dam Type

Earth

Surface Area

10.1

Hydraulic Height

37

Drainage Area

0.24

Nid Storage

126

Structural Height

28

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

38
       
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.