Nelson Dam No. 2 is an earth dam located in Fall River County, South Dakota, built in 1999. It carries a Low hazard potential classification.
Dam profile
NID height · 23 ft23 ft tall and 950 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 Nelson Dam No. 2
The primary purpose of Nelson Dam No. 2 is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Usda Fs (federal). It impounds the West Fork Hay Canyon.
The dam stands 23 feet tall and stretches 950 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 123 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1999, the structure is 27 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. The most recent inspection on record was 08/28/2001. That was over 25 years ago.
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Location
| State | South Dakota |
| County | Fall River |
| River/Stream | West Fork Hay Canyon |
| Coordinates | 43.32782, -103.15783 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 950 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 123 acre-ft |
| Max Storage | 123 acre-ft |
| Normal Storage | 53 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 620 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Usda Fs |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/28/2001 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02485 |
| Federal ID | SD02485 |
| More Info | State Dam Safety Program |