Neilsen #1
Neilsen #1 is an earth dam located in Mellette County, South Dakota, built in 1968. It carries a Low hazard potential classification.
About Neilsen #1
The primary purpose of Neilsen #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 Neilsen (private). It impounds the Tr Cottonwood Cr Offstream.
The dam stands 35 feet tall and stretches 550 feet across, and has a maximum storage capacity of 75 acre-feet. Completed in 1968, 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.
At 35 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | South Dakota |
| County | Mellette |
| Nearest City | None |
| River/Stream | Tr Cottonwood Cr Offstream |
| Coordinates | 43.65499, -100.76666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 550 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 75 acre-ft |
| Max Storage | 75 acre-ft |
| Normal Storage | 54 acre-ft |
| Max Discharge | 1,037 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | NEILSEN |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01469 |
| Federal ID | SD01469 |
| More Info | State Dam Safety Program |