Stromer Herman No.2 Reservoir Report
Nearby: Strain Ranch No. 3 Neilsen #1
Last Updated: December 10, 2025
Located in Mellette, South Dakota, Stromer Herman No.2 is a private earth dam built in 1964 to regulate the flow of the TR Little White R Offstream.
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Summary
Managed by the Natural Resources Conservation Service, this dam stands at a height of 36 feet with a hydraulic height of 30 feet and a length of 310 feet, providing a storage capacity of 23 acre-feet. With a low hazard potential and a condition assessment of "Not Rated," Stromer Herman No.2 plays a crucial role in water resource management in the region.
Despite being a privately owned structure, Stromer Herman No.2 is regulated by the South Dakota Department of Environment and Natural Resources, ensuring that it meets state permitting, inspection, and enforcement requirements. The dam is designed to contain a maximum discharge of 221 cubic feet per second, with a normal storage capacity of 16 acre-feet. While the dam's risk assessment and emergency preparedness measures are currently not rated, its strategic location and functional design contribute to the overall resilience of the water resource infrastructure in the area.
With its strategic placement and history of reliable performance since its construction, Stromer Herman No.2 serves as a vital component of the local water management system. As climate change continues to impact water resources, structures like Stromer Herman No.2 play a crucial role in mitigating potential risks and ensuring a sustainable water supply for both agricultural and ecological needs in South Dakota.
Year Completed |
1964 |
Dam Length |
310 |
Dam Height |
36 |
River Or Stream |
TR LITTLE WHITE R OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
23 |
Hazard Potential |
Low |
Nid Height |
36 |
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.
Stromer Herman No.2