Honokowai - Structure #8 Reservoir Report
Last Updated: December 19, 2025
Honokowai - Structure #8, located in Honokowai, Maui, Hawaii, is a vital flood risk reduction structure designed by the USDA NRCS and completed in 1995.
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Summary
This Earth dam stands at a height of 41 feet, with a hydraulic and structural height of 50 feet, spanning a length of 710 feet. With a primary purpose of flood risk reduction, this structure serves to protect the surrounding area from potential inundation and damage during heavy rainfall events.
The dam has a storage capacity of 281 acre-feet, with a normal storage of 79 acre-feet and a drainage area of 5.98 square miles. Despite being classified as having a high hazard potential, the structure is assessed to be in fair condition as of the latest assessment in April 2021. Regular inspections are conducted every 5 years to ensure the integrity and functionality of the dam, with the last inspection taking place in November 2016. The spillway, outlet gates, and locks are uncontrolled, highlighting the importance of proper maintenance and monitoring to mitigate any potential risks associated with the dam.
Managed by the local government and regulated by the DLNR, Honokowai - Structure #8 plays a crucial role in the flood risk management strategy of the area. With Tulsi Gabbard (D) as the representative for the Honolulu District, the structure stands as a testament to the collaboration between federal and state agencies in safeguarding the community against the impacts of extreme weather events. For water resource and climate enthusiasts, this dam serves as a fascinating example of engineering ingenuity and environmental stewardship in the face of changing climate patterns and increasing flood risks.
Year Completed |
1995 |
Dam Length |
710 |
Dam Height |
41 |
River Or Stream |
HONOKOWAI |
Primary Dam Type |
Earth |
Surface Area |
5.4 |
Hydraulic Height |
41 |
Drainage Area |
5.98 |
Nid Storage |
281 |
Structural Height |
50 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
50 |
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.
Honokowai - Structure #8