Magnesia is an earth dam located in Garfield County, Montana, built in 1960. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 275 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 Magnesia
The primary purpose of Magnesia 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 Burlington Northern Rr (private). It impounds the Phillips Creek near Cohagen.
The dam stands 12 feet tall and stretches 275 feet across, and has a maximum storage capacity of 53 acre-feet. Completed in 1960, the structure is well into its service life at over 50 years old.
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 | Garfield |
| Nearest City | Cohagen |
| River/Stream | Phillips Creek |
| Coordinates | 47.05010, -106.71790 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 275 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 53 acre-ft |
| Max Storage | 53 acre-ft |
| Normal Storage | 22 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Burlington Northern Rr |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03270 |
| Federal ID | MT03270 |
| More Info | State Dam Safety Program |