R. Fields No.4 Reservoir Report
Nearby: R. Fields No.5 A. Herron No.1
Last Updated: December 6, 2025
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Summary
Fields No.4 is a privately owned earth dam located in Ziebach, South Dakota, along the TR-CHEYENNE river. It was completed in 1950 and stands at a height of 21 feet, with a length of 800 feet. The dam has a storage capacity of 242 acre-feet, with a maximum discharge of 2625 cfs. While it is regulated by the South Dakota Department of Environment and Natural Resources, its hazard potential is rated as low.
Managed by the Natural Resources Conservation Service, R. Fields No.4 has not undergone a recent condition assessment and is currently not rated for its overall condition. However, it is reported to be regularly inspected, permitted, and enforced by state agencies. The dam does not have an emergency action plan in place, and there are no inundation maps prepared for potential risk assessment. Despite its low hazard potential, the dam's risk management measures and overall risk assessment remain unspecified.
Water resource and climate enthusiasts interested in R. Fields No.4 can appreciate its historical significance as a mid-century infrastructure project contributing to water management along the TR-CHEYENNE river. The dam's modest storage capacity and discharge capabilities reflect its role in supporting agricultural and environmental needs in the region. As a privately owned structure, its regulation and maintenance by state agencies ensure its continued safety and functionality, while the absence of recent assessments and emergency plans warrants further attention from stakeholders in ensuring its long-term resilience against potential hazards.
Year Completed |
1950 |
Dam Length |
800 |
Dam Height |
21 |
River Or Stream |
TR-CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
242 |
Hazard Potential |
Low |
Nid Height |
21 |
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.
R. Fields No.4