Niemi No.5 Reservoir Report
Nearby: Niemi No.4 Niemi No.1
Last Updated: December 6, 2025
Niemi No.5 is a privately owned earth dam located in Harding, South Dakota, along the Trib-s Fork Grand River.
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Summary
Built in 1957 by the Natural Resources Conservation Service, this dam stands at a height of 14 feet and has a storage capacity of 108 acre-feet, with a normal storage level of 100 acre-feet. With a low hazard potential and a condition assessment of "Not Rated", Niemi No.5 serves as a critical water resource infrastructure in the region.
Despite being regulated by the South Dakota Department of Environment and Natural Resources, Niemi No.5 has not been inspected recently and lacks emergency action preparedness measures. The dam, with a length of 330 feet and a maximum discharge capacity of 1,260 cubic feet per second, plays a crucial role in water management and flood control in the area. However, the absence of a current condition assessment and emergency preparedness plan raises concerns for the potential risks associated with this structure.
With its strategic location and historical significance, Niemi No.5 serves as a vital component of the water resource infrastructure in South Dakota. The dam's importance in managing water flow and reducing flood risks highlights the need for regular inspections and emergency preparedness measures to ensure the safety and resilience of this essential structure in the face of changing climate patterns and increasing water resource demands.
Year Completed |
1957 |
Dam Length |
330 |
Dam Height |
14 |
River Or Stream |
TRIB-S FORK GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
14 |
Nid Storage |
108 |
Hazard Potential |
Low |
Nid Height |
14 |
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.
Niemi No.5