Nelder Ebert No.1 Reservoir Report
Nearby: Nelder Ebert No.2 Nelder Ebert No.3
Last Updated: December 6, 2025
Nelder Ebert No.1 is a privately owned earth dam located in Corson, South Dakota, with a maximum storage capacity of 78 acre-feet and a normal storage capacity of 65 acre-feet.
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Summary
Completed in 1950, this dam stands at a height of 18 feet and spans a length of 920 feet, serving the primary purpose of water resource management for the TR-GRAND river or stream. Despite being regulated by the South Dakota Department of Environment and Natural Resources (DENR) and maintained by the Natural Resources Conservation Service, the dam is currently rated as having a low hazard potential and its condition remains unrated.
Situated within the St. Paul District of the US Army Corps of Engineers, Nelder Ebert No.1 plays a crucial role in flood control and water supply management in the region, with the capacity to handle a maximum discharge of 1312 cubic feet per second. While details on inspection frequency, emergency action plans, and risk assessment are not provided, the dam's location and design suggest a strategic importance in mitigating the impacts of extreme weather events and climate variability. With the dam's condition yet to be fully assessed and emergency response plans yet to be formalized, there is a need for continued monitoring and maintenance to ensure the long-term resilience of this vital water infrastructure in the face of changing climate conditions.
Year Completed |
1950 |
Dam Length |
920 |
Dam Height |
18 |
River Or Stream |
TR-GRAND |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
78 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
Nelder Ebert No.1