Johnson, Howard (pondera) is an earth dam located in Pondera County, Montana, built in 1939. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 300 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, Howard (pondera)
Johnson, Howard (pondera) is a dam in Pondera, Montana. The dam is owned by Howard S Johnson (private). It impounds the Tr-dead Indian Coulee near Loma.
The dam stands 15 feet tall and stretches 300 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 138 acre-feet. Completed in 1939, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
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Location
| State | Montana |
| County | Pondera |
| Nearest City | Loma |
| River/Stream | Tr-dead Indian Coulee |
| Coordinates | 48.17780, -111.44570 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 300 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 138 acre-ft |
| Max Storage | 138 acre-ft |
| Normal Storage | 54 acre-ft |
| Surface Area | 3 acres |
Ownership & Safety
| Purpose | Other |
| Owner | Howard S Johnson |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01077 |
| Federal ID | MT01077 |
| More Info | State Dam Safety Program |