Mraz Bros Reservoir Report
Nearby: M. Mraz B. Silverman Dam
Last Updated: December 7, 2025
Mraz Bros is a private dam located in Ziebach, South Dakota, along the TR MOREAU river.
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Summary
Built in 1954, this earth dam stands at 27 feet high and spans 480 feet in length, with a storage capacity of 157 acre-feet. The dam is owned and 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.
Managed by the Natural Resources Conservation Service, Mraz Bros has been assessed as having a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. While no recent inspection date is available, the dam's emergency action plan status and risk management measures are also not specified. Despite this lack of detailed information, Mraz Bros remains a significant structure in the region, contributing to water resource management efforts and climate resilience initiatives in South Dakota.
For water resource and climate enthusiasts, Mraz Bros offers a glimpse into the intricate network of dams that play a crucial role in safeguarding communities against flooding and ensuring sustainable water supply. As a privately owned and state-regulated dam, its presence underscores the collaborative efforts between stakeholders to balance water management needs with environmental conservation priorities. Moving forward, continued monitoring and maintenance of Mraz Bros will be essential to uphold its integrity and contribute to the overall resilience of the region's water infrastructure in the face of changing climate patterns.
Year Completed |
1954 |
Dam Length |
480 |
Dam Height |
27 |
River Or Stream |
TR MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
157 |
Hazard Potential |
Low |
Nid Height |
27 |
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.
Mraz Bros