Circle Eagle Reservoir Report
Nearby: R. Compton Delbridge Dam
Last Updated: December 6, 2025
Circle Eagle is a historic dam located in Ziebach, South Dakota, with a primary purpose of water supply.
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Summary
Built in 1939, this Earth-type dam stands at a height of 20 feet and has a length of 630 feet, providing a storage capacity of 186 acre-feet. Situated on the TR CHEYENNE river, Circle Eagle serves as a vital water resource for the tribal government in the area.
Despite its age, Circle Eagle has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. While it is not regulated or inspected by the state, the dam continues to fulfill its water supply function for the community. With its picturesque location and rich history, Circle Eagle remains a significant structure for water resource and climate enthusiasts to explore in South Dakota.
The dam's surroundings offer a serene backdrop for nature enthusiasts to appreciate the beauty of the St. Paul District and the contributions of Dusty Johnson (R) in the region. As Circle Eagle stands as a testament to the importance of water management and infrastructure in sustaining communities, its legacy continues to inspire a deeper appreciation for the intersection of water resources and climate resilience in the area.
Year Completed |
1939 |
Dam Length |
630 |
Dam Height |
20 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
186 |
Structural Height |
20 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Circle Eagle