Robinson #4 is an earth dam located in Custer County, Montana, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 33 ft33 ft tall and 500 ft long, taller than 76% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Robinson #4
The primary purpose of Robinson #4 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 Floyd Robinson (private). It impounds the Tr-hercules Creek near Mizpah.
The dam stands 33 feet tall and stretches 500 feet across, and has a maximum storage capacity of 146 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.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Montana |
| County | Custer |
| Nearest City | Mizpah |
| River/Stream | Tr-hercules Creek |
| Coordinates | 46.01250, -105.32000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 500 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 146 acre-ft |
| Max Storage | 146 acre-ft |
| Normal Storage | 74 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Floyd Robinson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01693 |
| Federal ID | MT01693 |
| More Info | State Dam Safety Program |