Henry Dam Reservoir Report
Nearby: Dry Draw Dam Mule Creek Dam
Last Updated: December 6, 2025
Henry Dam, located in Ardmore, South Dakota, is a privately owned earth dam built in 1951 with a maximum storage capacity of 160 acre-feet.
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Summary
The dam stands at a height of 20 feet and spans a length of 950 feet along the TR-Cheyenne river. Despite being classified as low hazard potential, the dam is regulated and inspected by the South Dakota Department of Environment and Natural Resources, ensuring its safety and compliance with state regulations.
Owned by a private entity, Henry Dam plays a crucial role in water resource management in the Fall River County area. With a normal storage capacity of 122 acre-feet and a maximum discharge rate of 650 cubic feet per second, the dam serves as a vital infrastructure for flood control and water supply. Managed by the Natural Resources Conservation Service, the dam has not been rated for its current condition but undergoes regular inspections to ensure its structural integrity.
Located within the jurisdiction of the state, Henry Dam stands as a testament to effective water resource management in South Dakota. With its low hazard potential and adherence to state regulatory standards, the dam serves as a reliable asset for the community, providing essential water storage and flood protection services. Climate and water enthusiasts can appreciate the strategic design and purposeful construction of Henry Dam in safeguarding the local environment and enhancing water resource sustainability.
Year Completed |
1951 |
Dam Length |
950 |
Dam Height |
20 |
River Or Stream |
TR-CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
160 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Henry Dam