Rigby, South
Rigby, South is an earth dam located in Pondera County, Montana, built in 1918. It carries a Low hazard potential classification.
About Rigby, South
The primary purpose of Rigby, South is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Willis B Rigby_sr (private). It impounds the South Pondera Coulee near Loma.
The dam stands 15 feet tall and stretches 300 feet across, and has a maximum storage capacity of 138 acre-feet. Completed in 1918, the structure is over a century 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 | Pondera |
| Nearest City | Loma |
| River/Stream | South Pondera Coulee |
| Coordinates | 48.10240, -111.77370 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 300 ft |
| Year Completed | 1918 (108 years old) |
Storage & Hydraulics
| NID Storage | 138 acre-ft |
| Max Storage | 138 acre-ft |
| Normal Storage | 54 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | WILLIS B RIGBY_SR |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00040 |
| Federal ID | MT00040 |
| More Info | State Dam Safety Program |