B. Cnot Ratedtis Reservoir Report
Nearby: M.A. Cnot Ratedtis M. Webb
Last Updated: December 8, 2025
B.
°F
°F
mph
Wind
%
Humidity
Summary
Cnot Ratedtis is a privately owned dam located in Dewey, South Dakota, along the TR MOREAU river. Built in 1955 by the Natural Resources Conservation Service, this earth dam stands at a height of 20 feet with a length of 500 feet, providing a storage capacity of 72 acre-feet. Despite its age, the dam has not been officially rated for its condition, although it is considered to have a low hazard potential.
The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR), with state jurisdiction, permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations. With Dusty Johnson as the Congressional representative for the area, B. Cnot Ratedtis is just one of the many structures under the oversight of the St. Paul District of the US Army Corps of Engineers. Although there is no associated emergency action plan or risk assessment, the dam is still considered to be in a stable condition.
Water resource and climate enthusiasts may find B. Cnot Ratedtis to be an intriguing case study due to its vintage construction, state regulation, and low hazard potential. The dam's location along the TR MOREAU river adds to its significance in the local water management system. While the lack of a formal condition assessment raises questions about its long-term viability, the presence of state oversight and regulatory measures indicates a commitment to ensuring the safety and functionality of this important infrastructure.
Year Completed |
1955 |
Dam Length |
500 |
Dam Height |
20 |
River Or Stream |
TR MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
72 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Grand R At Little Eagle Sd
|
47cfs |
Moreau R Near Faith Sd
|
14cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
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.
B. Cnot Ratedtis