Wieman Dam Reservoir Report
Nearby: Ortman Dam Cooper Dam
Last Updated: December 13, 2025
Wieman Dam, located in Turner County, South Dakota, is a privately owned earth dam that was completed in 2007 by Clark Engineering.
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Summary
The dam stands at a height of 30 feet and has a storage capacity of 129 acre-feet, with a normal storage level of 70 acre-feet. It is situated on the TR W Fork Vermillion River and is regulated by the South Dakota Department of Environment and Natural Resources (DENR).
With a low hazard potential and a moderate risk assessment rating, Wieman Dam plays a crucial role in managing water resources in the area. The dam has an uncontrolled spillway with a width of 45 feet and a maximum discharge capacity of 930 cubic feet per second. While the condition assessment has not been rated, the dam is subject to state inspection, permitting, and enforcement to ensure its safety and functionality.
Despite the lack of detailed information on emergency preparedness and risk management measures, Wieman Dam serves as a vital infrastructure for water resource management in the region. With its strategic location and design, the dam contributes to the overall water supply and flood control efforts in Turner County, making it a significant asset for both water resource and climate enthusiasts.
Year Completed |
2007 |
Dam Length |
350 |
Dam Height |
30 |
River Or Stream |
TR W FORK VERMILLION RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Drainage Area |
2 |
Nid Storage |
129 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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.
Wieman Dam