Eightmile Spring is an earth dam located in Chouteau County, Montana, built in 1953. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 800 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 Eightmile Spring
The primary purpose of Eightmile Spring 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 Olson Farms Inc. (private). It impounds the Eightmile Coulee near Tunis.
The dam stands 15 feet tall and stretches 800 feet across, and has a maximum storage capacity of 85 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 | Chouteau |
| Nearest City | Tunis |
| River/Stream | Eightmile Coulee |
| Coordinates | 47.81010, -110.83080 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 800 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 85 acre-ft |
| Max Storage | 85 acre-ft |
| Normal Storage | 44 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Olson Farms Inc. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03539 |
| Federal ID | MT03539 |
| More Info | State Dam Safety Program |