Kaupale Reservoir Reservoir Report

Last Updated: December 19, 2025

Kaupale Reservoir, located in Lawai Homesteads, Kauai, Hawaii, is a privately owned water source regulated by the state's Department of Land and Natural Resources.


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Summary

Built in 1910 for irrigation purposes, this Earth dam stands 50 feet tall and stretches 500 feet in length, with a storage capacity of 240 acre-feet. The reservoir is fed by the Lawai Stream and covers an area of 11 acres, serving as a vital resource for agricultural activities in the region.

Despite being classified with a high hazard potential, Kaupale Reservoir is currently in fair condition, as assessed in April 2021. It undergoes inspections every five years, with the most recent one completed in December 2019. The reservoir's emergency action plan is under review, ensuring preparedness for any potential risks associated with its operation. With its moderate risk assessment rating, the reservoir plays a crucial role in managing water resources in the area, supporting sustainable agriculture and environmental conservation efforts.

Enthusiasts of water resources and climate will be intrigued by Kaupale Reservoir's historical significance and functional importance in maintaining irrigation systems in Kauai. Its strategic location, efficient design, and capacity to store water make it a key asset for the local community. While facing some risk factors, the reservoir's management practices and regular inspections demonstrate a commitment to ensuring its continued operation and safety for the surrounding environment and residents.

Year Completed

1910

Dam Length

500

Dam Height

49

River Or Stream

TR-LAWAI STREAM

Primary Dam Type

Earth

Surface Area

11

Hydraulic Height

44

Drainage Area

0.25

Nid Storage

240

Structural Height

50

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

50
       
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.