Triple 7 Ranch Dam is an earth dam located in Custer County, South Dakota, built in 1963. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 1,200 ft long, taller than 74% 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 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.
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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 |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02338 |
| Federal ID | SD02338 |
| More Info | State Dam Safety Program |