Tnot Ratedtle Creek Dam Reservoir Report
Nearby: Lermeny Dam Egland Dam
Last Updated: December 6, 2025
Tnot Ratedtle Creek Dam, located in Harding, South Dakota, is a privately owned earth dam that was completed in 1948.
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Summary
With a height of 21 feet and a length of 470 feet, the dam has a storage capacity of 84 acre-feet, making it an essential structure for water resource management in the area. Situated on the TR-GRAND RIVER, the dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular inspections to ensure its safety and compliance with state regulations.
Despite being classified as having a low hazard potential, the condition of Tnot Ratedtle Creek Dam is currently marked as "Not Rated," indicating a need for further assessment. The dam has not been modified in recent years, and there is no Emergency Action Plan (EAP) in place, suggesting a potential area for improvement in terms of emergency preparedness. With a maximum discharge capacity of 1,875 cubic feet per second, the dam plays a critical role in flood control and water supply management for the region.
Overall, Tnot Ratedtle Creek Dam serves as a vital infrastructure for the community, providing essential water storage and flood protection along the TR-GRAND RIVER. As climate change continues to impact weather patterns and water resources, the proper maintenance and monitoring of dams like Tnot Ratedtle Creek are crucial to ensure their resilience and effectiveness in the face of evolving environmental challenges.
Year Completed |
1948 |
Dam Length |
470 |
Dam Height |
21 |
River Or Stream |
TR-GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
84 |
Hazard Potential |
Low |
Nid Height |
21 |
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.
Tnot Ratedtle Creek Dam