Mandernach And Carlson 6 Reservoir Report
Last Updated: December 6, 2025
Mandernach and Carlson 6 is a privately owned earth dam located in Ziebach, South Dakota, along the TR Cheyenne River.
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Summary
Constructed in 1952 by the Natural Resources Conservation Service, this dam stands at a height of 24 feet and spans 700 feet in length. With a storage capacity of 385 acre-feet, it serves as a critical water resource for the region, holding a normal storage level of 248 acre-feet.
Despite being regulated by the South Dakota Department of Environment and Natural Resources, Mandernach and Carlson 6 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Although lacking recent inspection and assessment data, this dam plays a vital role in managing water resources in the area, with a maximum discharge capacity of 3150 cubic feet per second. While the dam's emergency action plan status and risk management measures remain unclear, its presence underscores the importance of maintaining and monitoring critical infrastructure to mitigate potential hazards and ensure sustainable water resource management in the face of changing climatic conditions.
Year Completed |
1952 |
Dam Length |
700 |
Dam Height |
24 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Nid Storage |
385 |
Hazard Potential |
Low |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Faith Sd
|
14cfs |
Cheyenne R Near Plainview Sd
|
0cfs |
Moreau R Near Whitehorse Sd
|
35cfs |
Belle Fourche River Near Elm Springs
|
17900cfs |
Elk Cr Near Elm Springs 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.
Mandernach And Carlson 6