Nix Number 1 Reservoir Report
Nearby: Baker Number 1 Nix Number 3
Last Updated: December 8, 2025
Nix Number 1 is a private dam located in Jones, South Dakota, along the TR-Whiteriver.
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Summary
Built in 1960 by the Natural Resources Conservation Service, this earth dam stands at 30 feet tall and spans 630 feet in length. With a storage capacity of 131 acre-feet, it serves multiple purposes including flood control, irrigation, and water supply for the surrounding area. Despite its age, the dam is still in good condition and poses a low hazard potential.
Managed by the South Dakota Department of Environment and Natural Resources, Nix Number 1 is regularly inspected, permitted, and regulated to ensure its structural integrity and safety. The dam has a maximum discharge capacity of 1500 cubic feet per second and a normal storage level of 106 acre-feet. While it has not been rated for condition assessment, the dam has not shown any signs of deterioration or instability. The surrounding community is well-protected from any potential risks associated with the dam.
With Dusty Johnson serving as the local Congressional Representative, Nix Number 1 plays a vital role in water resource management in the region. Its strategic location and efficient design make it a crucial infrastructure for sustaining the local ecosystem and supporting agricultural activities. As climate change continues to impact water resources, Nix Number 1 stands as a resilient structure that contributes to the overall water security of South Dakota.
Year Completed |
1960 |
Dam Length |
630 |
Dam Height |
30 |
River Or Stream |
TR-WHITERIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
131 |
Hazard Potential |
Low |
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.
Nix Number 1