Iris is an earth dam located in Garfield County, Montana, built in 1950. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 400 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 Iris
The primary purpose of Iris 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 Iris Hanson (private). It impounds the Little Dry Creek near Cohagen.
The dam stands 12 feet tall and stretches 400 feet across, and has a maximum storage capacity of 70 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 | Garfield |
| Nearest City | Cohagen |
| River/Stream | Little Dry Creek |
| Coordinates | 47.00700, -106.89290 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 400 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 30 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Iris Hanson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02667 |
| Federal ID | MT02667 |
| More Info | State Dam Safety Program |