Jacobi Dam Reservoir Report
Nearby: Largis Dam North Dam
Last Updated: December 6, 2025
Jacobi Dam, located in Harding, South Dakota, is a privately owned earth dam that was completed in 1951.
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Summary
With a height of 22 feet and a storage capacity of 158 acre-feet, the dam serves the primary purpose of regulating the flow of the TR-Grand River. Managed by the South Dakota Department of Environment and Natural Resources (DENR), Jacobi Dam is subject to state regulation, inspection, and enforcement to ensure its safety and functionality.
Despite its low hazard potential and current "Not Rated" condition assessment, Jacobi Dam plays a crucial role in water resource management and climate resilience efforts in the region. The dam's maximum discharge capacity of 3150 cubic feet per second provides flood protection and water supply benefits to the surrounding communities. While specific risk management measures and emergency action plans are not currently documented, the dam's operation and maintenance are overseen by state agencies to mitigate potential risks and ensure public safety.
As a key component of the water infrastructure in the area, Jacobi Dam contributes to the overall sustainability and resilience of the region's water resources in the face of changing climate conditions. The dam's presence underscores the importance of continued monitoring, maintenance, and adaptation strategies to address potential hazards and ensure the long-term effectiveness of this critical water management structure.
Year Completed |
1951 |
Dam Length |
800 |
Dam Height |
22 |
River Or Stream |
TR-GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Nid Storage |
158 |
Hazard Potential |
Low |
Nid Height |
22 |
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.
Jacobi Dam