Herman Number 18 Reservoir Report
Nearby: Herman Number 17 Herman #15
Last Updated: December 13, 2025
Herman Number 18 is a privately-owned dam located in Jones, South Dakota, along the TR-BAD River.
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Summary
Built in 1953 by the Natural Resources Conservation Service, this earth-type dam stands at a height of 31 feet and has a storage capacity of 25 acre-feet. Although the dam is not currently rated for its condition, it is classified as having a low hazard potential.
The dam is under the regulatory jurisdiction of the South Dakota Department of Environment and Natural Resources, with permitting, inspection, and enforcement responsibilities falling under state control. While the dam has not been modified in recent years and lacks specific emergency preparedness measures such as an Emergency Action Plan (EAP), it is considered to be in a stable condition. With a maximum discharge capacity of 315 cubic feet per second, Herman Number 18 plays a crucial role in managing water resources in the area and contributes to the overall water management efforts in South Dakota.
For enthusiasts interested in water resource management and climate resilience, Herman Number 18 serves as a key infrastructure component in the St. Paul District. With a focus on maintaining the dam's functionality and ensuring its regulatory compliance, the dam underscores the importance of ongoing monitoring and maintenance to mitigate potential risks and safeguard the surrounding community and environment. As climate change continues to impact water resources, understanding the role of dams like Herman Number 18 in water management becomes increasingly vital for sustainable and resilient infrastructure planning.
Year Completed |
1953 |
Dam Length |
242 |
Dam Height |
31 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
31 |
Nid Storage |
25 |
Hazard Potential |
Low |
Nid Height |
31 |
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.
Herman Number 18