Mandernach And Carlson 2 Reservoir Report
Last Updated: December 6, 2025
Mandernach and Carlson 2 is a privately owned dam located in Ziebach, South Dakota, along the TR CHEYENNE river.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1941, this Earth-type dam stands at a height of 23 feet and has a length of 1300 feet. With a maximum storage capacity of 1518 acre-feet and a normal storage capacity of 785 acre-feet, this dam plays a crucial role in managing water resources in the area.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Mandernach and Carlson 2 is regulated, permitted, inspected, and enforced by the state agency. With a low hazard potential and a condition assessment of "Not Rated," this dam ensures the safety and security of the surrounding community. Although there is no Emergency Action Plan (EAP) in place currently, the dam meets regulatory guidelines and continues to serve its primary purpose effectively.
As a significant structure within the St. Paul District of the US Army Corps of Engineers, Mandernach and Carlson 2 provides valuable water resource management capabilities for the region. With its strategic location and the support of state and federal agencies, this dam stands as a testament to effective collaboration and stewardship in ensuring the sustainability of water resources and climate resilience in South Dakota.
Year Completed |
1941 |
Dam Length |
1300 |
Dam Height |
23 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
23 |
Nid Storage |
1518 |
Hazard Potential |
Low |
Nid Height |
23 |
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 2