Rahn Number 1 Reservoir Report
Nearby: Hight Number 3 Rahn Number 2
Last Updated: December 8, 2025
Rahn Number 1 is a privately owned earth dam located in Jones, South Dakota, along the TR-WHITERIVER.
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Summary
Built in 1959 by the Natural Resources Conservation Service, this dam stands at a height of 28 feet and has a storage capacity of 26 acre-feet. With a low hazard potential, the dam has not been rated for its current condition and has not undergone recent inspections or maintenance assessments. Despite its age, Rahn Number 1 continues to serve its purpose of water resource management in the area.
Situated within the St. Paul District of the USACE, Rahn Number 1 plays a crucial role in regulating water flow and storage in the region. Although the dam has not been modified in recent years and lacks certain safety features such as spillways and outlet gates, it remains a vital infrastructure for the local community. With a maximum discharge capacity of 500 cfs, the dam contributes to flood control and water supply management efforts in the area.
Despite its age and limited structural features, Rahn Number 1 continues to be a key component of water resource management in Jones, South Dakota. As a privately owned dam under state jurisdiction, its role in regulating water flow along the TR-WHITERIVER is essential for maintaining water security and mitigating flood risks in the region. Further assessments and inspections may be necessary to ensure the continued safety and effectiveness of this important infrastructure.
Year Completed |
1959 |
Dam Length |
279 |
Dam Height |
28 |
River Or Stream |
TR-WHITERIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
28 |
Nid Storage |
26 |
Hazard Potential |
Low |
Nid Height |
28 |
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.
Rahn Number 1