Niemi No.1 Reservoir Report
Nearby: Niemi No.2 Niemi No.3
Last Updated: December 6, 2025
Niemi No.1 is a privately owned earth dam located in Harding, South Dakota, along the Tributary Fork Grand River.
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Summary
Constructed in 1960 by the Natural Resources Conservation Service, this dam stands at a height of 25 feet and has a storage capacity of 47 acre-feet. With a low hazard potential and a condition assessment that is currently not rated, Niemi No.1 plays a critical role in water resource management in the region.
Despite its age, Niemi No.1 is regulated by the South Dakota Department of Environment and Natural Resources, with state permitting, inspection, and enforcement measures in place to ensure its safety and compliance with regulations. The dam has a maximum discharge capacity of 1575 cubic feet per second and a normal storage capacity of 39 acre-feet, serving as a key component in flood control and water supply management for the local community.
With its strategic location and importance in water resource management, Niemi No.1 represents a vital piece of infrastructure in South Dakota. As climate change continues to impact water resources, the proper maintenance and regulation of dams like Niemi No.1 are essential to ensure the safety and sustainability of water supplies for both current and future generations.
Year Completed |
1960 |
Dam Length |
245 |
Dam Height |
25 |
River Or Stream |
TRIB-S FORK GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
47 |
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.
Niemi No.1