Hoffman Dam is an earth dam located in Pennington County, South Dakota, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 360 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 Hoffman Dam
The primary purpose of Hoffman Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Norman Geigle (private). It impounds the Tr-cheyenne.
The dam stands 20 feet tall and stretches 360 feet across, and has a maximum storage capacity of 230 acre-feet. Completed in 1940, 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 | Pennington |
| Nearest City | None |
| River/Stream | Tr-cheyenne |
| Coordinates | 44.21666, -102.19499 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 360 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 230 acre-ft |
| Max Storage | 230 acre-ft |
| Normal Storage | 90 acre-ft |
| Max Discharge | 1,800 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Norman Geigle |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01076 |
| Federal ID | SD01076 |
| More Info | State Dam Safety Program |