Clavel No.1 Reservoir Report
Nearby: Jack Hunt Clavel No.2
Last Updated: December 6, 2025
Clavel No.1 is a private-owned earth dam located in Ziebach, South Dakota, along the TR Cheyenne river.
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Summary
Built in 1947 with a height of 23 feet and a length of 1000 feet, this dam has a storage capacity of 518 acre-feet and a maximum discharge rate of 6000 cubic feet per second. It falls under the jurisdiction of the South Dakota Department of Environment and Natural Resources (DENR), which regulates, inspects, and enforces safety measures for the structure.
Despite its age, Clavel No.1 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam has not been modified in recent years, and its emergency action plan (EAP) status is unknown. The dam does not have associated inundation maps or risk assessment information available. With its historical significance and role in water resource management along the TR Cheyenne river, Clavel No.1 serves as a reminder of the importance of maintaining and monitoring aging infrastructure to ensure public safety and environmental protection in the face of changing climate conditions.
Year Completed |
1947 |
Dam Length |
1000 |
Dam Height |
23 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
23 |
Nid Storage |
518 |
Hazard Potential |
Low |
Nid Height |
23 |
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.
Clavel No.1