Mandernach And Carlson 4 Reservoir Report
Last Updated: December 6, 2025
Mandernach and Carlson 4 is a private dam located in Ziebach, South Dakota, along the TR CHEYENNE river, constructed in 1954 by the Natural Resources Conservation Service.
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Summary
This earth dam stands at a height of 25 feet and has a length of 460 feet, providing a maximum storage capacity of 179 acre-feet. Despite its age, the dam is classified as having a low hazard potential and is currently not rated in terms of condition assessment.
The dam is regulated by the South Dakota Department of Environment and Natural Resources and undergoes regular inspections, permitting, and enforcement to ensure its structural integrity and safety. With a normal storage capacity of 95 acre-feet and a maximum discharge of 2100 cubic feet per second, Mandernach and Carlson 4 serves as a vital water resource for the surrounding area. Although not designated as a USACE (United States Army Corps of Engineers) dam, it plays a crucial role in water management and flood control within the St. Paul District.
Due to its strategic location and historical significance, Mandernach and Carlson 4 serves as a prime example of successful private dam ownership and management in South Dakota. This dam not only provides essential water storage but also contributes to the overall sustainability and resilience of the local ecosystem, making it a valuable asset for water resource and climate enthusiasts alike.
Year Completed |
1954 |
Dam Length |
460 |
Dam Height |
25 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
179 |
Hazard Potential |
Low |
Nid Height |
25 |
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 4