Dugan Number 1 Reservoir Report
Nearby: Dykstra Number 1 Rahn Number 3
Last Updated: December 8, 2025
Dugan Number 1 is a privately owned earth dam located in Jones, South Dakota, along the TR-WHITERIVER.
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Summary
Built in 1953, this dam stands at a height of 25 feet and has a length of 390 feet, with a storage capacity of 21 acre-feet. Despite being regulated by the South Dakota Department of Environment and Natural Resources, its hazard potential is rated as low, and the condition assessment is currently not rated.
The dam is managed by the Natural Resources Conservation Service and has not undergone any modifications or inspections in recent years. With a maximum discharge capacity of 375 cubic feet per second, Dugan Number 1 poses a low risk to the surrounding area. While it has not been assessed for emergency preparedness or risk management measures, the dam remains a significant structure in the water resource management system of South Dakota. For water resource and climate enthusiasts, Dugan Number 1 presents an opportunity to explore the intersection of infrastructure, regulation, and environmental stewardship in the region.
Year Completed |
1953 |
Dam Length |
390 |
Dam Height |
25 |
River Or Stream |
TR-WHITERIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
21 |
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.
Dugan Number 1