A Irion #1 is an earth dam located in Powder River County, Montana, built in 1953. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 210 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 A Irion #1
The primary purpose of A Irion #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 Alvin Irion (private). It impounds the Mizpah Creek near Mizpah.
The dam stands 12 feet tall and stretches 210 feet across, and has a maximum storage capacity of 79 acre-feet. Completed in 1953, 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 | Powder River |
| Nearest City | Mizpah |
| River/Stream | Mizpah Creek |
| Coordinates | 45.67350, -105.43250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 210 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 79 acre-ft |
| Max Storage | 79 acre-ft |
| Normal Storage | 29 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Alvin Irion |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01724 |
| Federal ID | MT01724 |
| More Info | State Dam Safety Program |