Gravely is an earth dam located in Powell County, Montana, built in 1973. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 400 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 Gravely
The primary purpose of Gravely is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Ray Murray (private). It impounds the Threemile Creek near Avon.
The dam stands 25 feet tall and stretches 400 feet across, and has a maximum storage capacity of 57 acre-feet. Completed in 1973, 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 | Powell |
| Nearest City | Avon |
| River/Stream | Threemile Creek |
| Coordinates | 46.68040, -112.55710 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 400 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 57 acre-ft |
| Max Storage | 57 acre-ft |
| Normal Storage | 25 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Ray Murray |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01377 |
| Federal ID | MT01377 |
| More Info | State Dam Safety Program |