Oset #1 is an earth dam located in Musselshell County, Montana, built in 1945. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 1,000 ft long, taller than 68% of U.S. dams with a recorded height. 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 Oset #1
The primary purpose of Oset #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 Rickey R. Downs & Stephanie J. Downs Trust (private). It impounds the North Willow Creek near Mosby.
The dam stands 30 feet tall and stretches 1,000 feet across, and has a maximum storage capacity of 71 acre-feet. Completed in 1945, 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 | Musselshell |
| Nearest City | Mosby |
| River/Stream | North Willow Creek |
| Coordinates | 46.61910, -108.52410 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1945 (81 years old) |
Storage & Hydraulics
| NID Storage | 71 acre-ft |
| Max Storage | 71 acre-ft |
| Normal Storage | 41 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Rickey R. Downs & Stephanie J. Downs Trust |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02223 |
| Federal ID | MT02223 |
| More Info | State Dam Safety Program |