Mandernach And Carlson 5 Reservoir Report
Last Updated: December 6, 2025
Mandernach and Carlson 5 is a privately owned earth dam located in Ziebach, South Dakota, along the TR CHEYENNE river.
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Summary
Built in 1961, this dam stands at a height of 15 feet and has a length of 700 feet, providing a storage capacity of 155 acre-feet. With a maximum discharge of 5250 cubic feet per second, this structure serves as a crucial water management asset in the region.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Mandernach and Carlson 5 is subject to state regulations, inspections, and enforcement measures to ensure its safety and functionality. Despite being classified as low hazard potential, the dam's condition assessment is currently not rated, highlighting the need for further evaluation and maintenance. With its proximity to the St. Paul District of the US Army Corps of Engineers and oversight by Congressman Dusty Johnson, this dam plays a vital role in water resource management in the area.
While Mandernach and Carlson 5 may not have a designated primary purpose, its presence contributes to the overall water management efforts in South Dakota. With features such as an outlet gate and a hydraulic height of 15 feet, this earth dam stands as a testament to the ongoing efforts to regulate and maintain water resources in the region. As climate change continues to impact water availability and quality, structures like Mandernach and Carlson 5 are essential for ensuring sustainable water management practices for the future.
Year Completed |
1961 |
Dam Length |
700 |
Dam Height |
15 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
155 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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 5