Iverson Number 1 Reservoir Report
Nearby: Noldner Number 1 Niedan Number 1
Last Updated: December 8, 2025
Iverson Number 1 is a private dam located in Jones, South Dakota, regulated by the South Dakota Department of Environment and Natural Resources.
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Summary
Built in 1958, this earth dam stands at a height of 26 feet and stretches 453 feet in length, with a storage capacity of 49 acre-feet. The dam is situated on TR-BADRIVER within the St. Paul District, and its primary purpose and associated structures are unspecified.
Despite its low hazard potential and not having a current condition assessment rating, Iverson Number 1 is subject to state regulation, permitting, inspection, and enforcement. The dam has a maximum discharge capacity of 882 cubic feet per second and is overseen by the Natural Resources Conservation Service in terms of design. While emergency preparedness information such as an Emergency Action Plan and inundation maps are not readily available, the dam does not fall under the jurisdiction of the U.S. Army Corps of Engineers. For water resource and climate enthusiasts, Iverson Number 1 presents an intriguing case study in dam management and regulation within the state of South Dakota.
Year Completed |
1958 |
Dam Length |
453 |
Dam Height |
26 |
River Or Stream |
TR-BADRIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
49 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
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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.
Iverson Number 1