Pirate Dam is an earth dam located in Chouteau County, Montana, built in 1982. It carries a Significant hazard potential classification.
Dam profile
NID height · 60 ft60 ft tall and 500 ft long, taller than 95% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Pirate Dam
Pirate Dam is a dam in Chouteau, Montana. The dam is owned by Harrison Land & Livestock (private). It impounds the Shaw Creek near Highwood.
The dam stands 60 feet tall and stretches 500 feet across, and has a maximum storage capacity of 192 acre-feet. Completed in 1982, the structure is 44 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 60 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Montana |
| County | Chouteau |
| Nearest City | Highwood |
| River/Stream | Shaw Creek |
| Coordinates | 47.47510, -110.71080 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 60 ft |
| Dam Height | 60 ft |
| Dam Length | 500 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 192 acre-ft |
| Max Storage | 192 acre-ft |
| Normal Storage | 192 acre-ft |
| Max Discharge | 100 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Harrison Land & Livestock |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03779 |
| Federal ID | MT03779 |
| More Info | State Dam Safety Program |