Offerdahl-johnson Dam
Offerdahl-johnson Dam is an earth dam located in Phillips County, Montana, built in 1980. It carries a Low hazard potential classification.
About Offerdahl-johnson Dam
The primary purpose of Offerdahl-johnson Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Aetna Insurance Company (private). It impounds the Little Seven Mile Creek near Saco.
The dam stands 17 feet tall and stretches 1,840 feet across, creates a reservoir covering 132 acres, and has a maximum storage capacity of 900 acre-feet. Completed in 1980, the structure is 46 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 | Little Seven Mile Creek |
| Coordinates | 48.00150, -107.66960 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 1,840 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 900 acre-ft |
| Max Storage | 900 acre-ft |
| Normal Storage | 900 acre-ft |
| Surface Area | 132 acres |
Ownership & Safety
| Purpose | Irrigation |
| Owner | AETNA INSURANCE COMPANY |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03798 |
| Federal ID | MT03798 |
| More Info | State Dam Safety Program |