Circle Eagle is an earth dam located in Ziebach County, South Dakota, built in 1939. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 630 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Circle Eagle
The primary purpose of Circle Eagle is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Cheyenne River Sioux Tribe (federal). It impounds the Tr Cheyenne.
The dam stands 20 feet tall and stretches 630 feet across, and has a maximum storage capacity of 186 acre-feet. Completed in 1939, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | South Dakota |
| County | Ziebach |
| Nearest City | None |
| River/Stream | Tr Cheyenne |
| Coordinates | 44.81333, -101.98332 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 630 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 186 acre-ft |
| Max Storage | 186 acre-ft |
| Normal Storage | 72 acre-ft |
| Max Discharge | 1,220 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Cheyenne River Sioux Tribe |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02108 |
| Federal ID | SD02108 |
| More Info | State Dam Safety Program |