Johnson (toole) is an earth dam located in Toole County, Montana, built in 1953. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 830 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 Johnson (toole)
The primary purpose of Johnson (toole) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Cecil S Benjamin (private). It impounds the Tr-dunkirk Coulee near Devon.
The dam stands 15 feet tall and stretches 830 feet across, has a maximum storage capacity of 186 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1953, 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 | Toole |
| Nearest City | Devon |
| River/Stream | Tr-dunkirk Coulee |
| Coordinates | 48.49160, -111.58570 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 830 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 186 acre-ft |
| Max Storage | 186 acre-ft |
| Normal Storage | 95 acre-ft |
| Drainage Area | 6 sq mi |
| Max Discharge | 600 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Cecil S Benjamin |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00430 |
| Federal ID | MT00430 |
| More Info | State Dam Safety Program |