Big (phillips) is an earth dam located in Phillips County, Montana, built in 1956. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 600 ft long, taller than 50% of U.S. dams with a recorded height. 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 Big (phillips)
The primary purpose of Big (phillips) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by L H Boyce (private). It impounds the John Brown Coulee near Saco.
The dam stands 25 feet tall and stretches 600 feet across, has a maximum storage capacity of 98 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1956, 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 | Phillips |
| Nearest City | Saco |
| River/Stream | John Brown Coulee |
| Coordinates | 48.07830, -107.92780 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 600 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 98 acre-ft |
| Max Storage | 98 acre-ft |
| Normal Storage | 84 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,000 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | L H Boyce |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01330 |
| Federal ID | MT01330 |
| More Info | State Dam Safety Program |