Ralph Hedman
Ralph Hedman is an earth dam located in Stanley County, South Dakota, built in 1958. It carries a Significant hazard potential classification.
About Ralph Hedman
The primary purpose of Ralph Hedman 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 Ralph Hedman (private). It impounds the Trib. Plum Creek near Hayes.
The dam stands 27 feet tall and stretches 660 feet across, and has a maximum storage capacity of 102 acre-feet. Completed in 1958, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
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Location
| State | South Dakota |
| County | Stanley |
| Nearest City | Hayes |
| River/Stream | Trib. Plum Creek |
| Coordinates | 44.38632, -100.99022 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 660 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 102 acre-ft |
| Max Storage | 102 acre-ft |
| Normal Storage | 59 acre-ft |
| Max Discharge | 759 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | RALPH HEDMAN |
| Owner Type | Private |
| Hazard Classification | Significant |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01574 |
| Federal ID | SD01574 |
| More Info | State Dam Safety Program |