Jerry Willuweit Reservoir Report
Nearby: Kirk Cordes Harold Severson
Last Updated: December 6, 2025
Jerry Willuweit is a private dam located in Pennington, South Dakota, along the TR Bad River.
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Summary
Built in 1937, this Earth-type structure stands at a height of 23 feet and spans 430 feet in length. With a storage capacity of 100 acre-feet and a maximum discharge rate of 1,746 cubic feet per second, Jerry Willuweit serves as an essential component of water resource management in the region.
Managed by the South Dakota Department of Agriculture and Natural Resources, Jerry Willuweit is regulated, permitted, inspected, and enforced to ensure its safety and functionality. Despite being classified as having a low hazard potential, the dam's condition remains unrated as of the last inspection conducted in August 1979. While the Emergency Action Plan status and risk assessment details are not available, this dam plays a crucial role in mitigating flood risks and providing water storage for the local community.
For water resource and climate enthusiasts, Jerry Willuweit presents an intriguing case study in dam infrastructure and management. With its historical significance, engineering design, and regulatory oversight, this private dam serves as a vital piece of the water management puzzle in South Dakota. As efforts continue to assess and improve its condition, Jerry Willuweit remains a key player in safeguarding the surrounding area from potential water-related hazards and ensuring sustainable water resource utilization for years to come.
Year Completed |
1937 |
Dam Length |
430 |
Dam Height |
23 |
River Or Stream |
TR BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
23 |
Drainage Area |
1 |
Nid Storage |
100 |
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.
Jerry Willuweit