Johnston is an earth dam located in Dawson County, Montana, built in 1954. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 600 ft long, taller than 68% 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 Johnston
The primary purpose of Johnston 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 Helen Hoffman (private). It impounds the Tr-pasture Creek near Poplar.
The dam stands 30 feet tall and stretches 600 feet across, and has a maximum storage capacity of 30 acre-feet. Completed in 1954, 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 | Dawson |
| Nearest City | Poplar |
| River/Stream | Tr-pasture Creek |
| Coordinates | 47.67550, -105.16360 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 600 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Normal Storage | 25 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Helen Hoffman |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00452 |
| Federal ID | MT00452 |
| More Info | State Dam Safety Program |