Benson Dam Reservoir Report
Nearby: Walder No.1 Johnny Johnson Dam
Last Updated: December 6, 2025
Benson Dam, located in Harding, South Dakota, is a privately owned structure that serves as a crucial water resource facility in the region.
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Summary
Completed in 1960, this earth-type dam stands at a height of 23 feet and has a storage capacity of 135 acre-feet. It is regulated by the South Dakota Department of Environment and Natural Resources, ensuring that it meets all state permitting, inspection, and enforcement requirements.
The dam is situated on the TR-Moreau River and falls under the jurisdiction of the Omaha District of the US Army Corps of Engineers. Despite its low hazard potential and a condition assessment of "Not Rated," Benson Dam plays a significant role in managing water flow and storage in the area. With Dusty Johnson (R) representing the region in Congress, the dam's operation and maintenance are overseen by the Natural Resources Conservation Service.
Water resource and climate enthusiasts will appreciate the importance of Benson Dam in the context of water management and conservation efforts in South Dakota. Its strategic location and design contribute to flood control, irrigation, and water supply for the surrounding communities. While the dam's risk assessment and emergency preparedness details are yet to be fully evaluated, its role in ensuring water security and environmental sustainability in the region remains paramount.
Year Completed |
1960 |
Dam Length |
1200 |
Dam Height |
23 |
River Or Stream |
TR-MOREAU RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
23 |
Nid Storage |
135 |
Hazard Potential |
Low |
Nid Height |
23 |
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.
Benson Dam