Earl Hanrahan
Earl Hanrahan is an earth dam located in Haakon County, South Dakota, built in 1949. It carries a Low hazard potential classification.
About Earl Hanrahan
The primary purpose of Earl Hanrahan 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 Hanrahan Family Lllp (private). It impounds the West Fork Spotted Bear Creek.
The dam stands 12 feet tall and stretches 200 feet across, and has a maximum storage capacity of 67 acre-feet. Completed in 1949, 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 | Haakon |
| Nearest City | None |
| River/Stream | West Fork Spotted Bear Creek |
| Coordinates | 44.45852, -101.79059 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 200 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 67 acre-ft |
| Max Storage | 67 acre-ft |
| Normal Storage | 24 acre-ft |
| Max Discharge | 300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | HANRAHAN FAMILY LLLP |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01777 |
| Federal ID | SD01777 |
| More Info | State Dam Safety Program |