Thomas Number 2 Reservoir Report

Last Updated: April 29, 2026

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Thomas Number 2 is a privately owned dam located in Jones, South Dakota, along the Tributary White River.


Summary

Constructed in 1956, this earth dam stands at a height of 27 feet and has a length of 306 feet, providing a storage capacity of 24 acre-feet. Managed by the Natural Resources Conservation Service, the dam is regulated by the South Dakota Department of Environment and Natural Resources, ensuring that it meets state permitting, inspection, and enforcement standards.

With a low hazard potential and a current condition assessment of "Not Rated," Thomas Number 2 plays a crucial role in water resource management and flood control in the region. Although specific details regarding emergency action plans and risk assessments are not available, the dam's location and design contribute to its effectiveness in mitigating potential risks and protecting downstream communities. As a notable infrastructure within the St. Paul District of the US Army Corps of Engineers, Thomas Number 2 highlights the importance of collaboration between private owners, federal agencies, and state regulators in safeguarding water resources and enhancing climate resilience in South Dakota.

15-Day Long Term Forecast


Year Completed

1956

Dam Length

306

Dam Height

27

River Or Stream

TRRIB. WHITE RIVER

Primary Dam Type

Earth

Hydraulic Height

27

Nid Storage

24

Hazard Potential

Low

Nid Height

27
       
Seasonal Comparison

5-Day Hourly Forecast Detail

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.
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