Reynolds Number 2 Reservoir Report
Nearby: Reynolds Number 1 Foster Number 3
Last Updated: December 8, 2025
Reynolds Number 2, located in Jones, South Dakota, is a privately owned earth dam on the TR-Bad River.
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Summary
Built in 1956, this structure stands at a height of 25 feet and has a length of 765 feet, providing a storage capacity of 79 acre-feet. With a maximum discharge of 1570 cubic feet per second, Reynolds Number 2 serves as a vital resource for water management in the area.
Managed by the Natural Resources Conservation Service, Reynolds Number 2 is regulated by the South Dakota Department of Environment and Natural Resources. Despite being classified as a low hazard potential structure, its condition assessment is currently listed as "Not Rated". With state permitting, inspection, and enforcement in place, this dam plays a crucial role in flood control and water supply for the region.
For water resource and climate enthusiasts, Reynolds Number 2 presents an intriguing case study of a mid-20th century earth dam in South Dakota. As part of the St. Paul District, this structure not only serves practical purposes but also highlights the intersection of infrastructure, regulation, and environmental stewardship in managing water resources effectively.
Year Completed |
1956 |
Dam Length |
765 |
Dam Height |
25 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
79 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
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.
Reynolds Number 2