Arthun Dam
Arthun Dam is an earth dam located in Park County, Montana, built in 1956. It carries a Significant hazard potential classification.
About Arthun Dam
The primary purpose of Arthun Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Len Arthun (private). It impounds the Ut Antelope Creek near Clyde Park.
The dam stands 23 feet tall and stretches 155 feet across, has a maximum storage capacity of 186 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1956, 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.
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Location
| State | Montana |
| County | Park |
| Nearest City | Clyde Park |
| River/Stream | Ut Antelope Creek |
| Coordinates | 45.92647, -110.63894 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 155 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 186 acre-ft |
| Max Storage | 186 acre-ft |
| Normal Storage | 89 acre-ft |
| Drainage Area | 0 sq mi |
| Max Discharge | 200 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | LEN ARTHUN |
| Owner Type | Private |
| Hazard Classification | Significant |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00331 |
| Federal ID | MT00331 |
| More Info | State Dam Safety Program |