Olson No. 2 is an earth dam located in Mellette County, South Dakota, built in 1966. It carries a Low hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 155 ft long, taller than 62% 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 Olson No. 2
The primary purpose of Olson No. 2 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 Russell Olson (private). It impounds the Trib of Big White Off Stream.
The dam stands 28 feet tall and stretches 155 feet across, and has a maximum storage capacity of 17 acre-feet. Completed in 1966, 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.
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Location
| State | South Dakota |
| County | Mellette |
| Nearest City | None |
| River/Stream | Trib of Big White Off Stream |
| Coordinates | 43.70833, -100.78999 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 155 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 17 acre-ft |
| Max Storage | 17 acre-ft |
| Normal Storage | 11 acre-ft |
| Max Discharge | 650 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Russell Olson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01265 |
| Federal ID | SD01265 |
| More Info | State Dam Safety Program |