Arnt Jorgenson Reservoir Report
Nearby: Francis Veal Beryl Veal
Last Updated: December 6, 2025
Arnt Jorgenson is a privately owned earth dam located in Perkins County, South Dakota, along the TR Moreau River.
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Summary
Built in 1953 by the Natural Resources Conservation Service, this structure stands at a height of 17 feet and has a length of 540 feet, providing a storage capacity of 60 acre-feet. The dam's primary purpose and associated structures are not specified, but it is regulated by the South Dakota Department of Environment and Natural Resources.
Despite being classified as having a low hazard potential, Arnt Jorgenson has not been rated for its condition assessment. The dam has not undergone recent inspections, with the last inspection date unspecified. Emergency action plans, risk assessments, and inundation maps have not been prepared or updated for this structure, raising concerns about its readiness for potential emergencies. The dam's overall risk management measures, including the presence of downstream emergency contacts and adherence to guidelines, also remain unclear.
Water resource and climate enthusiasts interested in Arnt Jorgenson can explore its location within the St. Paul District of the US Army Corps of Engineers, and its representation in Congress by Dusty Johnson (R). The dam's presence along the TR Moreau River highlights its significance in managing water resources in the region and underscores the importance of monitoring its condition and emergency preparedness. Further research and attention to this structure's maintenance and safety protocols are essential to ensure its continued effectiveness in water management and protection against potential hazards.
Year Completed |
1953 |
Dam Length |
540 |
Dam Height |
17 |
River Or Stream |
TR MOREAU RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
60 |
Hazard Potential |
Low |
Nid Height |
17 |
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.
Arnt Jorgenson