Reservoir 140 Reservoir Report
Last Updated: December 18, 2025
Reservoir 140, also known as Upper Field 3 Reservoir, is a privately-owned water storage structure located in Honokowai, Maui, Hawaii.
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Summary
Built in 1926 for irrigation purposes, this earth dam stands at a height of 35 feet and has a storage capacity of 53.3 acre-feet, with a normal storage level of 43 acre-feet. With a surface area of 3.3 acres and a drainage area of 0.01 square miles, Reservoir 140 plays a crucial role in supporting agriculture in the region.
Despite its age, Reservoir 140 remains in fair condition with a high hazard potential, prompting regular inspections every five years. The dam features an uncontrolled spillway with a width of 23 feet, capable of releasing a maximum discharge of 340 cubic feet per second. The structure is regulated by the Department of Land and Natural Resources (DLNR) in Hawaii and is deemed to meet moderate risk assessment guidelines. As a key component of the local water resource infrastructure, Reservoir 140 underscores the importance of sustainable water management practices in the face of climate variability and changing hydrological conditions.
Water resource and climate enthusiasts can appreciate Reservoir 140 for its historical significance and ongoing role in supporting agricultural activities in Maui. As a vital part of the water supply system in the region, this reservoir serves as a reminder of the importance of maintaining and monitoring aging infrastructure to ensure water security and resilience in the face of evolving climate challenges. With its unique design features and regulatory oversight, Reservoir 140 stands as a testament to the intersection of human ingenuity and environmental stewardship in managing water resources for future generations.
Year Completed |
1926 |
Dam Length |
900 |
Dam Height |
35 |
River Or Stream |
HONOKOWAI STREAM OFFSTREAM |
Primary Dam Type |
Earth |
Surface Area |
3.3 |
Hydraulic Height |
26 |
Drainage Area |
0.01 |
Nid Storage |
53.3 |
Structural Height |
29 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Camp Olowalu - Maui
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Camp Olowalu
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papalau camping
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Reservoir 140