Riedy Dam
Riedy Dam is an earth dam located in Perkins County, South Dakota, built in 1934. It carries a Low hazard potential classification.
About Riedy Dam
The primary purpose of Riedy Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Francis Connolly (private). It impounds the E. Thunder Hawk Creek.
The dam stands 22 feet tall and stretches 350 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1934, 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. The most recent inspection on record was 12/06/1999. That was over 26 years ago.
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Location
| State | South Dakota |
| County | Perkins |
| Nearest City | None |
| River/Stream | E. Thunder Hawk Creek |
| Coordinates | 45.87166, -102.01332 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 350 ft |
| Year Completed | 1934 (92 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 54 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 2,180 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | FRANCIS CONNOLLY |
| Owner Type | Private |
| Hazard Classification | Low |
| Last Inspection | 12/06/1999 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00924 |
| Federal ID | SD00924 |
| More Info | State Dam Safety Program |