Bob #4 is an earth dam located in Garfield County, Montana, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 190 ft long. 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 Bob #4
The primary purpose of Bob #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 Smith Ranch Co (private). It impounds the Graveyard Creek near Cohagen.
The dam stands 20 feet tall and stretches 190 feet across, and has a maximum storage capacity of 67 acre-feet. Completed in 1958, 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 | Garfield |
| Nearest City | Cohagen |
| River/Stream | Graveyard Creek |
| Coordinates | 46.98300, -106.55560 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 190 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 67 acre-ft |
| Max Storage | 67 acre-ft |
| Normal Storage | 34 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Smith Ranch Co |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02283 |
| Federal ID | MT02283 |
| More Info | State Dam Safety Program |