Triple 7 Ranch Dam
Triple 7 Ranch Dam is an earth dam located in Custer County, South Dakota, built in 1963. It carries a Low hazard potential classification.
About Triple 7 Ranch Dam
The primary purpose of Triple 7 Ranch Dam 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 The Nature Conservancy (private). It impounds the Dry Creek.
The dam stands 32 feet tall and stretches 1,200 feet across, has a maximum storage capacity of 2,000 acre-feet, and collects water from a drainage area of 43 square miles. Completed in 1963, the structure is well into its service life at over 50 years old.
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.
At 32 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | South Dakota |
| County | Custer |
| Nearest City | None |
| River/Stream | Dry Creek |
| Coordinates | 43.70285, -103.10521 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 2,000 acre-ft |
| Max Storage | 2,000 acre-ft |
| Normal Storage | 1,319 acre-ft |
| Drainage Area | 43 sq mi |
| Max Discharge | 2,900 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | The Nature Conservancy |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02338 |
| Federal ID | SD02338 |
| More Info | State Dam Safety Program |