Supenau Lake is an earth dam located in Hill County, Montana, built in 1959. It carries a Significant hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 200 ft long, taller than 86% 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 Supenau Lake
The primary purpose of Supenau Lake 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 Ruth E Gagel (private). It impounds the Tr-supeneau Creek near Havre.
The dam stands 40 feet tall and stretches 200 feet across, and has a maximum storage capacity of 293 acre-feet. Completed in 1959, the structure is well into its service life at over 50 years old.
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.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Montana |
| County | Hill |
| Nearest City | Havre |
| River/Stream | Tr-supeneau Creek |
| Coordinates | 48.62950, -109.83570 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 200 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 293 acre-ft |
| Max Storage | 293 acre-ft |
| Normal Storage | 196 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Ruth E Gagel |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03581 |
| Federal ID | MT03581 |
| More Info | State Dam Safety Program |