Henry Wilson Reservoir Report
Last Updated: December 6, 2025
Located in Stanley, South Dakota, the Henry Wilson dam is a privately owned structure that plays a crucial role in water resource management in the area.
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Summary
Constructed in 1962, this earth dam stands at a height of 26 feet and spans a length of 480 feet, with a maximum storage capacity of 28 acre-feet. Primarily regulating the flow of the TRIB. PLUM CREEK tributary, the dam is under state jurisdiction and is regulated by the South Dakota Department of Environment and Natural Resources.
Despite its low hazard potential, the condition of the Henry Wilson dam has not been officially rated, and no recent inspections have been documented. However, the structure is equipped with state-permitted outlets and inspections, highlighting its importance in ensuring water safety and security for the surrounding area. With its key role in water management and climate resilience efforts, Henry Wilson is a significant asset for both the local community and the environment as a whole.
Year Completed |
1962 |
Dam Length |
480 |
Dam Height |
26 |
River Or Stream |
TRIB. PLUM CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
28 |
Hazard Potential |
Low |
Nid Height |
26 |
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 Wilson