Circle C No.2 Reservoir Report
Nearby: Circle C No.1 M. Scism No.1
Last Updated: December 5, 2025
Circle C No.2 is a private dam located in Custer, South Dakota, along the TR-CHEYENNE river.
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Summary
Built in 1956 by the Natural Resources Conservation Service, this earth dam stands at 30 feet high and has a storage capacity of 85 acre-feet. With a drainage area of 2 square miles, Circle C No.2 can handle a maximum discharge of 262 cubic feet per second, making it a significant water resource in the region.
Although the dam has not been rated for its condition, it is considered to have a significant hazard potential. Despite being last inspected in 1979, Circle C No.2 is regulated, permitted, and inspected by the South Dakota Department of Agriculture and Natural Resources. With its purpose and associated structures not specified, this dam serves as a crucial infrastructure for water management in the area, ensuring water storage and flood control along the river.
As water resource and climate enthusiasts, understanding the importance and condition of dams like Circle C No.2 is vital for sustainable water management and disaster risk reduction. With its location, design, and regulatory oversight, Circle C No.2 plays a crucial role in the local ecosystem and community resilience, highlighting the intersection of water resources, infrastructure, and environmental stewardship in South Dakota.
Year Completed |
1956 |
Dam Length |
390 |
Dam Height |
30 |
River Or Stream |
TR-CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Drainage Area |
2 |
Nid Storage |
85 |
Hazard Potential |
Significant |
Nid Height |
30 |
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 C No.2