Mercer Number 1 is an earth dam located in Hughes County, South Dakota, built in 1950. It carries a Low hazard potential classification.
Dam profile
NID height · 9 ft9 ft tall and 475 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 Mercer Number 1
The primary purpose of Mercer Number 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 A. Mercer (private). It impounds the Tr-medicine Knoll Creek near Canning.
The dam stands 9 feet tall and stretches 475 feet across, and has a maximum storage capacity of 53 acre-feet. Completed in 1950, 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.
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Location
| State | South Dakota |
| County | Hughes |
| Nearest City | Canning |
| River/Stream | Tr-medicine Knoll Creek |
| Coordinates | 44.50499, -99.86666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 475 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 53 acre-ft |
| Max Storage | 53 acre-ft |
| Normal Storage | 8 acre-ft |
| Max Discharge | 105 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | A. Mercer |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00910 |
| Federal ID | SD00910 |
| More Info | State Dam Safety Program |