Mandernach & Carlson Reservoir Report
Last Updated: December 6, 2025
Mandernach & Carlson is a privately owned dam located in Ziebach, South Dakota, along the TR CHEYENNE river.
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Summary
Built in 1947, this Earth-type dam stands at 26 feet high and spans 610 feet in length, with a storage capacity of 223 acre-feet. The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR), with state permitting, inspection, and enforcement in place to ensure its safety and compliance.
Despite being categorized as low hazard potential and not currently rated for condition assessment, Mandernach & Carlson serves as a crucial water resource infrastructure in the region. With a maximum discharge capacity of 2745 cubic feet per second, this dam plays a significant role in water management and flood control along the TR CHEYENNE river. The dam's normal storage capacity of 80 acre-feet provides essential water supply for agricultural, industrial, and residential purposes in the area, highlighting its importance in sustaining local communities and ecosystems.
As climate change continues to impact water resources and infrastructure, the maintenance and monitoring of dams like Mandernach & Carlson are essential for ensuring their resilience and effectiveness in the face of evolving environmental conditions. With state oversight and regulation in place, this dam remains a vital component of South Dakota's water management infrastructure, contributing to the overall resilience of the region's water resources in the face of a changing climate.
Year Completed |
1947 |
Dam Length |
610 |
Dam Height |
26 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
223 |
Hazard Potential |
Low |
Nid Height |
26 |
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