Mckinnsey Reservoir is an earth dam located in Hill County, Montana, built in 1914. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 750 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 Mckinnsey Reservoir
The primary purpose of Mckinnsey Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Black Butte Ranch Inc. (private). It impounds the Tr-sage Creek near Gildford.
The dam stands 16 feet tall and stretches 750 feet across, creates a reservoir covering 131 acres, and has a maximum storage capacity of 960 acre-feet. Completed in 1914, the structure is over a century 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 | Hill |
| Nearest City | Gildford |
| River/Stream | Tr-sage Creek |
| Coordinates | 48.79300, -110.49290 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 750 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 960 acre-ft |
| Max Storage | 960 acre-ft |
| Normal Storage | 576 acre-ft |
| Surface Area | 131 acres |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Black Butte Ranch Inc. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00276 |
| Federal ID | MT00276 |
| More Info | State Dam Safety Program |