Jans 1
Jans 1 is an earth dam located in Mellette County, South Dakota, built in 1936. It carries a Low hazard potential classification.
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.
At 32 feet, this dam is taller than 76% of dams nationwide.
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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 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01310 |
| Federal ID | SD01310 |
| More Info | State Dam Safety Program |