Murnions (jim)
Murnions (jim) is an earth dam located in Garfield County, Montana, built in 1938. It carries a Significant hazard potential classification.
About Murnions (jim)
The primary purpose of Murnions (jim) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by James J Murnion (private). It impounds the Tr-big Dry Creek.
The dam stands 20 feet tall and stretches 1,320 feet across, and has a maximum storage capacity of 557 acre-feet. Completed in 1938, 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 | Garfield |
| Nearest City | None |
| River/Stream | Tr-big Dry Creek |
| Coordinates | 47.33900, -106.53870 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,320 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 557 acre-ft |
| Max Storage | 557 acre-ft |
| Normal Storage | 248 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JAMES J MURNION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01078 |
| Federal ID | MT01078 |
| More Info | State Dam Safety Program |