M.A. Cnot Ratedtis Reservoir Report
Nearby: F. Cnot Ratedtis Thorstensen 3
Last Updated: December 14, 2025
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Summary
Cnot Ratedtis is a privately owned dam located in Dewey, South Dakota, along the TR MOREAU river. Built in 1950, this earth dam stands at a height of 26 feet and has a length of 600 feet, with a storage capacity of 70 acre-feet. Despite being regulated by the South Dakota Department of Environment and Natural Resources (DENR), the dam is currently not rated for its condition and has a low hazard potential.
The dam's primary purpose and associated structures are not specified, but it is equipped with a spillway and has a maximum discharge capacity of 1120 cubic feet per second. Although there is no information on its maintenance and inspection history, M.A. Cnot Ratedtis is subject to state permitting, inspection, and enforcement, indicating a commitment to ensuring its safety and integrity. The dam's location within the St. Paul District of the US Army Corps of Engineers adds an additional layer of oversight and regulatory compliance.
For water resource and climate enthusiasts, M.A. Cnot Ratedtis presents an intriguing case study in dam management and safety. With its unique characteristics and location in a potentially flood-prone area, understanding its condition and risk assessment is vital for ensuring the protection of downstream communities and ecosystems. As a privately owned structure with state and federal regulatory involvement, this dam serves as a reminder of the complex interplay between human infrastructure, natural resources, and environmental stewardship in the face of changing climatic conditions.
Year Completed |
1950 |
Dam Length |
600 |
Dam Height |
26 |
River Or Stream |
TR MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
70 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Grand R At Little Eagle Sd
|
47cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
Moreau R Near Faith Sd
|
14cfs |
Cheyenne R Near Plainview Sd
|
0cfs |
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.
M.A. Cnot Ratedtis