Number Twenty Reservoir is an earth dam located in Phillips County, Montana, built in 1950. It carries a Low hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 300 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 Number Twenty Reservoir
The primary purpose of Number Twenty Reservoir 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 R Ereaux, Et Al (private). It impounds the Tr-second Creek.
The dam stands 10 feet tall and stretches 300 feet across, and has a maximum storage capacity of 132 acre-feet. Completed in 1950, 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 | Phillips |
| Nearest City | None |
| River/Stream | Tr-second Creek |
| Coordinates | 47.78890, -107.79780 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 300 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 132 acre-ft |
| Max Storage | 132 acre-ft |
| Normal Storage | 17 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | R Ereaux, Et Al |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02685 |
| Federal ID | MT02685 |
| More Info | State Dam Safety Program |