Post Lake Dam
Post Lake Dam is an earth dam located in Sully County, South Dakota, built in 1936. It carries a Low hazard potential classification.
About Post Lake Dam
The primary purpose of Post Lake Dam 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 Dakota Spur Llc. (private). It impounds the Medicine Knoll Creek-tr.
The dam stands 21 feet tall and stretches 400 feet across, and has a maximum storage capacity of 344 acre-feet. Completed in 1936, 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 | Sully |
| Nearest City | None |
| River/Stream | Medicine Knoll Creek-tr |
| Coordinates | 44.62206, -99.90271 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 400 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 344 acre-ft |
| Max Storage | 344 acre-ft |
| Normal Storage | 288 acre-ft |
| Max Discharge | 500 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | DAKOTA SPUR LLC. |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00444 |
| Federal ID | SD00444 |
| More Info | State Dam Safety Program |