Iversen Number 1 Reservoir Report
Nearby: Iversen Number 2 Iversen Number 5
Last Updated: December 8, 2025
Iversen Number 1 is a privately owned dam located in Jones, South Dakota, along the TR-BAD RIVER.
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Summary
Constructed in 1959 by the Natural Resources Conservation Service, this earth dam stands at a height of 27 feet and has a length of 357 feet. The dam has a storage capacity of 52 acre-feet and a maximum discharge rate of 1008 cubic feet per second. Despite being classified as having a low hazard potential, the dam's condition is currently listed as "Not Rated", suggesting a need for further assessment and potential maintenance.
This dam falls under the regulatory jurisdiction of the South Dakota Department of Environment and Natural Resources, which oversees the permitting, inspection, and enforcement processes. Although the dam is state-regulated and meets all necessary requirements, it has not been assessed for its emergency action plan or risk management measures. With its location in a rural area and minimal surrounding structures, the impact of any potential failure on downstream areas may be limited. However, given the lack of recent inspection and assessment data, it is crucial for the owners to prioritize the safety and maintenance of Iversen Number 1 to ensure its long-term stability and functionality for water resource management and climate resilience in the region.
Year Completed |
1959 |
Dam Length |
357 |
Dam Height |
27 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
52 |
Hazard Potential |
Low |
Nid Height |
27 |
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.
Iversen Number 1