Louis Bonhorst Number 2 Reservoir Report
Last Updated: December 14, 2025
Louis Bonhorst Number 2 is a privately owned dam located in Stanley, South Dakota, with a history dating back to its completion in 1958.
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Summary
This earth dam stands at a height of 35 feet and stretches 350 feet in length, providing a storage capacity of 36 acre-feet. Situated on a tributary to the Bad River, this dam is regulated by the South Dakota Department of Environment and Natural Resources, ensuring compliance with state permitting, inspection, and enforcement requirements.
Managed by the Natural Resources Conservation Service, Louis Bonhorst Number 2 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite its age and lack of recent inspection data, this dam serves a crucial role in water resource management in the area. With a maximum discharge capacity of 735 cubic feet per second, the dam plays a significant role in flood control and water storage for the surrounding community.
While lacking specific details on emergency action plans and risk management measures, Louis Bonhorst Number 2 remains an essential piece of infrastructure in the region. As water resource and climate enthusiasts continue to monitor and advocate for sustainable water management practices, the importance of maintaining and upgrading dams like Louis Bonhorst Number 2 will be crucial in ensuring the safety and resilience of communities in the face of changing climate patterns and increasing water demands.
Year Completed |
1958 |
Dam Length |
350 |
Dam Height |
35 |
River Or Stream |
TRIBUTARY TOBAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
35 |
Nid Storage |
36 |
Hazard Potential |
Low |
Nid Height |
35 |
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.
Louis Bonhorst Number 2