Mandernach & Carlson No. Reservoir Report
Last Updated: December 6, 2025
Mandernach & Carlson No., located in Ziebach, South Dakota, is a private-owned earth dam constructed in 1950 with a maximum storage capacity of 165 acre-feet.
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Summary
The dam stands at a height of 24 feet along the TR CHEYENNE stream, serving the primary purpose of water resource management in the area. Managed by the Natural Resources Conservation Service, this dam plays a crucial role in regulating water flow and mitigating flood risks in the region.
With a low hazard potential and a current condition assessment of "Not Rated," Mandernach & Carlson No. is under the jurisdiction of the South Dakota Department of Environment and Natural Resources (DENR). The dam has passed state inspection, and its state-regulated status ensures ongoing monitoring and enforcement to maintain its structural integrity. Despite not having an Emergency Action Plan (EAP) in place, the dam's design and construction by federal agencies adhere to regulatory standards for safety and environmental protection.
As a vital infrastructure in water management, Mandernach & Carlson No. serves as a testament to responsible dam design and maintenance practices. Its location along the TR CHEYENNE river, under the oversight of the St. Paul District of the US Army Corps of Engineers, highlights the collaborative efforts between private owners and governmental agencies to ensure the safety and sustainability of water resources in South Dakota. For water resource and climate enthusiasts, this dam stands as a model for effective water management and regulatory compliance in the face of changing environmental conditions.
Year Completed |
1950 |
Dam Length |
590 |
Dam Height |
24 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Nid Storage |
165 |
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 & Carlson No.