Big Timber #21 is an earth dam located in Rosebud County, Montana, built in 1944. It carries a Low hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 1,000 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 #21
The primary purpose of Big Timber #21 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 Big Timber Livestock Co (private). It impounds the Fords Creek Offstream near Mosby.
The dam stands 18 feet tall and stretches 1,000 feet across, has a maximum storage capacity of 60 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1944, 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 | Montana |
| County | Rosebud |
| Nearest City | Mosby |
| River/Stream | Fords Creek Offstream |
| Coordinates | 46.58900, -107.33860 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1944 (82 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 35 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,100 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Big Timber Livestock Co |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02308 |
| Federal ID | MT02308 |
| More Info | State Dam Safety Program |