City Of Mnot Rateddo Number #1 Reservoir Report
Nearby: King Number 1 Hattel Dam
Last Updated: December 8, 2025
City of Mnot Rateddo Number #1 is a significant earth dam located in Jones, South Dakota, along the TR-BAD RIVER.
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Summary
Completed in 1938, this dam stands at 39 feet high and stretches 1100 feet in length, with a storage capacity of 1740 acre-feet. It is owned and regulated by the local government, with inspection, permitting, and enforcement carried out by the South Dakota Department of Agriculture and Natural Resources (DANR).
Despite its age, City of Mnot Rateddo Number #1 has not been rated for its condition, with the last inspection dating back to 1981. The dam is considered to have a significant hazard potential, highlighting the importance of regular assessments and maintenance to ensure its safety and stability. With a maximum discharge capacity of 7300 cubic feet per second, it plays a crucial role in managing water resources and mitigating flood risks in the region.
For water resource and climate enthusiasts, City of Mnot Rateddo Number #1 presents an intriguing case study of a historic dam with a vital role in water management. Its location, design, and regulatory oversight provide valuable insights into the challenges and considerations involved in maintaining aging infrastructure in the face of changing climate conditions. As efforts continue to assess and address the condition of this dam, its significance as a key component of the local water system underscores the importance of sustainable water resource management practices.
Year Completed |
1938 |
Dam Length |
1100 |
Dam Height |
39 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
39 |
Drainage Area |
7 |
Nid Storage |
1740 |
Hazard Potential |
Significant |
Nid Height |
39 |
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.
City Of Mnot Rateddo Number #1