Jeffrey #2 is an earth dam located in Garfield County, Montana, built in 1922. It carries a Significant hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 475 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 Jeffrey #2
The primary purpose of Jeffrey #2 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 Gibbs Creek.
The dam stands 25 feet tall and stretches 475 feet across, and has a maximum storage capacity of 258 acre-feet. Completed in 1922, 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 | Garfield |
| Nearest City | None |
| River/Stream | Gibbs Creek |
| Coordinates | 47.28340, -106.28420 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 475 ft |
| Year Completed | 1922 (104 years old) |
Storage & Hydraulics
| NID Storage | 258 acre-ft |
| Max Storage | 258 acre-ft |
| Normal Storage | 132 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | John T Gibbs |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02354 |
| Federal ID | MT02354 |
| More Info | State Dam Safety Program |