Jeffrey #1
Jeffrey #1 is an earth dam located in Garfield County, Montana, built in 1958. It carries a Low hazard potential classification.
About Jeffrey #1
The primary purpose of Jeffrey #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John T Gibbs (private). It impounds the Big Wild Horse Creek.
The dam stands 18 feet tall and stretches 175 feet across, has a maximum storage capacity of 167 acre-feet, and collects water from a drainage area of 12 square miles. Completed in 1958, 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 | Garfield |
| Nearest City | None |
| River/Stream | Big Wild Horse Creek |
| Coordinates | 47.32330, -106.35930 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 175 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 167 acre-ft |
| Max Storage | 167 acre-ft |
| Normal Storage | 79 acre-ft |
| Drainage Area | 12 sq mi |
| Max Discharge | 1,000 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JOHN T GIBBS |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02353 |
| Federal ID | MT02353 |
| More Info | State Dam Safety Program |