Cool Black Rock
Cool Black Rock is an earth dam located in Hill County, Montana, built in 1919. It carries a Low hazard potential classification.
About Cool Black Rock
The primary purpose of Cool Black Rock 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 Alfred E Rathbun (private). It impounds the Rocky Coulee near Loma.
The dam stands 30 feet tall and stretches 900 feet across, and has a maximum storage capacity of 100 acre-feet. Completed in 1919, 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 | Hill |
| Nearest City | Loma |
| River/Stream | Rocky Coulee |
| Coordinates | 48.41800, -110.65580 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 900 ft |
| Year Completed | 1919 (107 years old) |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Max Storage | 100 acre-ft |
| Normal Storage | 50 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | ALFRED E RATHBUN |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00249 |
| Federal ID | MT00249 |
| More Info | State Dam Safety Program |