Circle Eagle
Key Takeaway
Circle Eagle is classified as low hazard in South Dakota. It was completed in 1939 and is 87 years old. Its primary use is water supply.
Physical Details
| Dam Height | 20 ft (taller than 33.7% in SD) |
| Dam Length | 630 ft |
| Dam Type | Earth |
| Max Storage | 186 acre-ft |
| Normal Storage | 72 acre-ft |
| Max Discharge | 1,220 cfs |
| Year Completed | 1939 (87 years old) |
| NID ID | SD02108 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
CHEYENNE RIVER SIOUX TRIBE
Federal Government
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Low Hazard 19 ftFrequently Asked Questions
What is the hazard classification of Circle Eagle?
Circle Eagle is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Circle Eagle?
Circle Eagle is owned by CHEYENNE RIVER SIOUX TRIBE (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Circle Eagle built?
Circle Eagle was completed in 1939, making it 87 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Circle Eagle?
Circle Eagle serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Circle Eagle?
Circle Eagle has a dam height of 20 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.