Black Out
Black Out is an earth dam located in Sheridan County, Montana, built in 1940. It carries a Low hazard potential classification.
About Black Out
The primary purpose of Black Out is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Leora Johansen (private). It impounds the Diffused Surface Water near Dagmar.
The dam stands 15 feet tall and stretches 250 feet across, and has a maximum storage capacity of 67 acre-feet. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 | Sheridan |
| Nearest City | Dagmar |
| River/Stream | Diffused Surface Water |
| Coordinates | 48.58948, -104.25320 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 250 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 67 acre-ft |
| Max Storage | 67 acre-ft |
| Normal Storage | 20 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | LEORA JOHANSEN |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03071 |
| Federal ID | MT03071 |
| More Info | State Dam Safety Program |