Big Timber #47 is an earth dam located in Rosebud County, Montana, built in 1955. It carries a Significant hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 375 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 Big Timber #47
The primary purpose of Big Timber #47 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 William Magelssen, Estate of (private). It impounds the Horse Creek near Vananda.
The dam stands 18 feet tall and stretches 375 feet across, and has a maximum storage capacity of 214 acre-feet. Completed in 1955, 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 | Montana |
| County | Rosebud |
| Nearest City | Vananda |
| River/Stream | Horse Creek |
| Coordinates | 46.41760, -107.04350 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 375 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 214 acre-ft |
| Max Storage | 214 acre-ft |
| Normal Storage | 124 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | William Magelssen, Estate of |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01961 |
| Federal ID | MT01961 |
| More Info | State Dam Safety Program |