C. Mraz Reservoir Report
Nearby: M. Mraz Bednar Dam
Last Updated: December 7, 2025
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Summary
Mraz is a privately owned dam located in Ziebach, South Dakota, along the TR-MOREAU river. Constructed in 1951, this earth dam stands at a height of 13 feet and spans 350 feet in length. The dam has a storage capacity of 56 acre-feet, with a normal storage level of 34 acre-feet. It is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular inspections, enforcement, and permitting processes to ensure its safety and compliance with state regulations.
Despite its low hazard potential and current "Not Rated" condition assessment, C. Mraz plays a crucial role in water resource management within the region. The dam serves as a vital structure for flood control, water supply, and irrigation purposes. While the dam's primary purpose is not specified, its presence contributes to the overall water infrastructure in South Dakota. Additionally, the dam is part of the St. Paul District of the US Army Corps of Engineers, further emphasizing its importance in the local water management system.
As a key component of the water infrastructure in Ziebach, South Dakota, C. Mraz's significance extends beyond its physical dimensions. With a history dating back to the early 1950s, the dam represents a longstanding commitment to managing water resources in the region. Its association with state and federal regulatory agencies underscores the collaborative efforts involved in ensuring the safety and efficacy of water infrastructure. For water resource and climate enthusiasts, C. Mraz serves as a tangible example of the intersections between human engineering, natural ecosystems, and regulatory frameworks in sustainable water management.
Year Completed |
1951 |
Dam Length |
350 |
Dam Height |
13 |
River Or Stream |
TR-MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
13 |
Nid Storage |
56 |
Hazard Potential |
Low |
Nid Height |
13 |
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.
C. Mraz