Island Weir Reservoir Report
Nearby: Lemoore Diversion Weir Crescent Weir
Last Updated: December 12, 2025
Island Weir, located in Kings County, California, serves as a critical structure for flood risk reduction and irrigation purposes along the North Fork Kings River.
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Summary
Built in 1926, this buttress dam stands at a height of 13 feet and spans 224 feet in length, with a storage capacity of 230 acre-feet. Despite its age, the dam has been deemed to have a low hazard potential and is in satisfactory condition as of the last assessment in September 2017.
Managed by a public utility in California, Island Weir is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. With a drainage area of 1,600 square miles, the dam plays a crucial role in managing water flow and protecting the surrounding areas from potential flooding. Its strategic location and design contribute to its effectiveness in mitigating flood risks while supporting agricultural irrigation needs in the region.
For water resource and climate enthusiasts, Island Weir represents a blend of historical significance and modern-day engineering practices in safeguarding water resources. As part of the Sacramento District, the dam stands as a testament to the ongoing efforts to balance water management for both practical and environmental purposes. With a focus on risk reduction and operational efficiency, Island Weir stands as a vital component of the water infrastructure in California's central valley.
Year Completed |
1926 |
Dam Length |
224 |
Dam Height |
13 |
River Or Stream |
Nfk Kings Rv |
Primary Dam Type |
Buttress |
Surface Area |
18 |
Hydraulic Height |
8 |
Drainage Area |
1600 |
Nid Storage |
230 |
Hazard Potential |
Low |
Nid Height |
13 |
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.
Island Weir