Circle C No.2 is an earth dam located in Custer County, South Dakota, built in 1956. It carries a Significant hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 390 ft long, taller than 68% of U.S. dams with a recorded height. 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 C No.2
The primary purpose of Circle C No.2 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Loren Sundquist (private). It impounds the Tr-cheyenne.
The dam stands 30 feet tall and stretches 390 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 85 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1956, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 08/07/1979. That was over 47 years ago.
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Location
| State | South Dakota |
| County | Custer |
| Nearest City | None |
| River/Stream | Tr-cheyenne |
| Coordinates | 43.77833, -102.79332 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 390 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 85 acre-ft |
| Max Storage | 85 acre-ft |
| Normal Storage | 48 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 262 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Loren Sundquist |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 08/07/1979 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01372 |
| Federal ID | SD01372 |
| More Info | State Dam Safety Program |