Mad Dam
Mad Dam is an earth dam located in Judith Basin County, Montana, built in 1955. It carries a Low hazard potential classification.
About Mad Dam
The primary purpose of Mad Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Philip & Peggy Johnson (private). It impounds the Tr-arrow Creek.
The dam stands 26 feet tall and stretches 25 feet across, and has a maximum storage capacity of 60 acre-feet. Completed in 1955, 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 | Judith Basin |
| Nearest City | None |
| River/Stream | Tr-arrow Creek |
| Coordinates | 47.35382, -110.56907 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 25 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 54 acre-ft |
| Max Discharge | 300 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | PHILIP & PEGGY JOHNSON |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01269 |
| Federal ID | MT01269 |
| More Info | State Dam Safety Program |