Reynolds Number 1 Reservoir Report
Nearby: Reynolds Number 2 Iversen Number 5
Last Updated: December 8, 2025
Reynolds Number 1 is a privately-owned earth dam located in Jones, South Dakota, along the TR-Bad River.
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Summary
Completed in 1960, this dam stands at a height of 26 feet and has a length of 381 feet. It has a storage capacity of 54 acre-feet, with a maximum discharge of 819 cubic feet per second. The dam is regulated by the South Dakota Department of Environment and Natural Resources, with state jurisdiction, permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.
With a low hazard potential and a condition assessment of "Not Rated," Reynolds Number 1 serves as an important water resource infrastructure in the area. While the dam does not have an emergency action plan in place, it meets state guidelines and is regularly monitored for any potential risks or safety concerns. The dam is not under the jurisdiction of the U.S. Army Corps of Engineers but is managed by the Natural Resources Conservation Service for design purposes.
Overall, Reynolds Number 1 plays a crucial role in water management and conservation efforts in South Dakota. Its presence along the TR-Bad River serves to regulate water flow, provide storage capacity, and protect downstream areas from potential flooding events. With proper maintenance and oversight, this dam continues to serve its primary purpose effectively while contributing to the overall water resource infrastructure in the region.
Year Completed |
1960 |
Dam Length |
381 |
Dam Height |
26 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
54 |
Hazard Potential |
Low |
Nid Height |
26 |
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.
Reynolds Number 1