Wilson Number 1 Reservoir Report
Nearby: Lyman Number 6 Ferdig Number 1
Last Updated: December 7, 2025
Wilson Number 1 is a privately owned earth dam located in South Dakota, specifically in Jones County, along the TR-Bad River.
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Summary
Constructed in 1953, this dam stands at a height of 27 feet and has a storage capacity of 71 acre-feet, with a normal storage level of 55 acre-feet. The dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.
The dam falls under the jurisdiction of the South Dakota Department of Environment and Natural Resources (DENR), which regulates and permits its operation. While it has not been inspected recently, the dam is subject to regular inspections, enforcement, and permitting by the state regulatory agency. The primary designer of Wilson Number 1 is the Natural Resources Conservation Service.
Overall, Wilson Number 1 serves as a vital structure for water resource management in the area, providing storage and regulation for the TR-Bad River. With its low hazard potential and state-regulated operation, this dam plays a crucial role in maintaining water security and climate resilience in South Dakota.
Year Completed |
1953 |
Dam Length |
564 |
Dam Height |
27 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
71 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
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 Number 1