O'farrell Dam No. 2
O'farrell Dam No. 2 is an earth dam located in Grant County, South Dakota, built in 2006. It carries a Low hazard potential classification.
About O'farrell Dam No. 2
The primary purpose of O'farrell Dam No. 2 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Marie O'farrell (private). It impounds the Tr-n. Fork Whetstone.
The dam stands 20 feet tall and stretches 400 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 65 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 2006, the structure is relatively new.
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 | Grant |
| River/Stream | Tr-n. Fork Whetstone |
| Coordinates | 45.30059, -96.95483 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 400 ft |
| Year Completed | 2006 (20 years old) |
Storage & Hydraulics
| NID Storage | 65 acre-ft |
| Max Storage | 65 acre-ft |
| Normal Storage | 32 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 2,026 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MARIE O'FARRELL |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02587 |
| Federal ID | SD02587 |
| More Info | State Dam Safety Program |