G N R R Dunkirk Reservoir is an earth dam located in Toole County, Montana, built in 1889. It carries a Significant hazard potential classification.
Dam profile
NID height · 14 ft14 ft tall and 549 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 G N R R Dunkirk Reservoir
The primary purpose of G N R R Dunkirk Reservoir is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Joe W Hawkins (private). It impounds the Dunkirk Coulee near Devon.
The dam stands 14 feet tall and stretches 549 feet across, and has a maximum storage capacity of 969 acre-feet. Completed in 1889, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
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Location
| State | Montana |
| County | Toole |
| Nearest City | Devon |
| River/Stream | Dunkirk Coulee |
| Coordinates | 48.48940, -111.66670 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 549 ft |
| Year Completed | 1889 (137 years old) |
Storage & Hydraulics
| NID Storage | 969 acre-ft |
| Max Storage | 969 acre-ft |
| Normal Storage | 353 acre-ft |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Joe W Hawkins |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00401 |
| Federal ID | MT00401 |
| More Info | State Dam Safety Program |