Jans 1 is an earth dam located in Mellette County, South Dakota, built in 1936. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 750 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 Jans 1
The primary purpose of Jans 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 Jans (private). It impounds the Trib. White Thunder Creek.
The dam stands 32 feet tall and stretches 750 feet across, and has a maximum storage capacity of 115 acre-feet. Completed in 1936, 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 | Mellette |
| Nearest City | None |
| River/Stream | Trib. White Thunder Creek |
| Coordinates | 43.61833, -100.52499 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 750 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 115 acre-ft |
| Max Storage | 115 acre-ft |
| Normal Storage | 80 acre-ft |
| Max Discharge | 1,397 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Jans |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01310 |
| Federal ID | SD01310 |
| More Info | State Dam Safety Program |