Mirage is an earth dam located in Spink County, South Dakota, built in 1972. It carries a Low hazard potential classification.
Dam profile
NID height · 38 ft38 ft tall and 720 ft long, taller than 84% 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 Mirage
The primary purpose of Mirage is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Gf&p (state). It impounds the Timber Creek Tributary.
The dam stands 38 feet tall and stretches 720 feet across, and has a maximum storage capacity of 1,600 acre-feet. Completed in 1972, 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. The most recent inspection on record was 10/17/2022.
At 38 feet, this dam is taller than 84% of dams nationwide.
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Location
| State | South Dakota |
| County | Spink |
| Nearest City | None |
| River/Stream | Timber Creek Tributary |
| Coordinates | 44.78393, -98.09711 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 720 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 1,600 acre-ft |
| Max Storage | 1,600 acre-ft |
| Normal Storage | 810 acre-ft |
| Max Discharge | 5,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Gf&p |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/17/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00038 |
| Federal ID | SD00038 |
| More Info | State Dam Safety Program |