Triple Seven No.1 is an earth dam located in Custer County, South Dakota, built in 1947. It carries a Low hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 900 ft long. 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 Seven No.1
The primary purpose of Triple Seven No.1 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 Hillenbrand Industries (private). It impounds the Tr-cheyenne.
The dam stands 18 feet tall and stretches 900 feet across, and has a maximum storage capacity of 115 acre-feet. Completed in 1947, 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 | Custer |
| Nearest City | None |
| River/Stream | Tr-cheyenne |
| Coordinates | 43.68543, -103.08994 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 900 ft |
| Year Completed | 1947 (79 years old) |
Storage & Hydraulics
| NID Storage | 115 acre-ft |
| Max Storage | 115 acre-ft |
| Normal Storage | 67 acre-ft |
| Max Discharge | 2,835 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Hillenbrand Industries |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01377 |
| Federal ID | SD01377 |
| More Info | State Dam Safety Program |