Wilson No.2 Reservoir Report
Nearby: Wilson No 1 Oja No.1
Last Updated: December 6, 2025
Wilson No.2 is a privately-owned earth dam located in Harding, South Dakota, along the TR-South Fork Grand River.
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Summary
Built in 1960 by the Natural Resources Conservation Service, this dam stands at a height of 26 feet and has a storage capacity of 520 acre-feet, with a normal storage level of 253 acre-feet. Despite its age, Wilson No.2 has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment.
While the dam has not been inspected recently and lacks certain emergency preparedness features such as an Emergency Action Plan, it is regulated by the South Dakota Department of Environment and Natural Resources. The dam's main purpose and associated structures are unspecified, but it serves as a vital component in managing water resources in the area. With a maximum discharge capacity of 1050 cubic feet per second, Wilson No.2 plays a crucial role in flood control and water supply management for the surrounding communities.
Although Wilson No.2 does not fall under the jurisdiction of the US Army Corps of Engineers, its presence contributes to the overall water infrastructure in the region. As water resource and climate enthusiasts, understanding the role of dams like Wilson No.2 in sustainable water management practices is essential for ensuring the long-term resilience of our water systems in the face of changing climate conditions.
Year Completed |
1960 |
Dam Length |
475 |
Dam Height |
26 |
River Or Stream |
TR-SOUTH FORK GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
520 |
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.
Wilson No.2