Clavel No.4 Reservoir Report
Nearby: M. Schatz No.1 Clavel No.2
Last Updated: December 6, 2025
Clavel No.4 is a privately-owned Earth dam located in Ziebach, South Dakota, along the TR CHEYENNE river.
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Summary
Built in 1962 by the Natural Resources Conservation Service, this dam stands at 26 feet tall with a length of 380 feet and a storage capacity of 170 acre-feet. With a maximum discharge of 1260 cubic feet per second, the dam serves a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.
Despite not being federally owned, Clavel No.4 is regulated by the South Dakota Department of Environment and Natural Resources (DENR) with state jurisdiction, permitting, inspection, and enforcement in place. The dam has a moderate risk assessment rating of 3, prompting the need for risk management measures to ensure its continued safe operation. Additionally, the dam features an uncontrolled spillway type and is situated in a region represented by Congressman Dusty Johnson.
Water resource and climate enthusiasts will find Clavel No.4 to be a fascinating structure, showcasing the importance of proper dam maintenance and risk management in mitigating potential hazards. Its location in South Dakota and connection to the TR CHEYENNE river highlight the critical role dams play in regulating water flow and providing essential storage capacity in the region. As efforts to address climate change intensify, understanding and safeguarding infrastructure like Clavel No.4 will be crucial in ensuring water security and resilience for the future.
Year Completed |
1962 |
Dam Length |
380 |
Dam Height |
26 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
170 |
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.
Clavel No.4