Ryan-tronrud Dam
Ryan-tronrud Dam is an earth dam located in Sweet Grass County, Montana, built in 1956. It carries a Significant hazard potential classification.
About Ryan-tronrud Dam
The primary purpose of Ryan-tronrud Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Chuck M Rein (private). It impounds the Tr-sweetgrass Creek near Melville.
The dam stands 22 feet tall and stretches 200 feet across, has a maximum storage capacity of 800 acre-feet, and collects water from a drainage area of 5 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 | Sweet Grass |
| Nearest City | Melville |
| River/Stream | Tr-sweetgrass Creek |
| Coordinates | 46.17897, -110.17991 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 200 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 800 acre-ft |
| Max Storage | 800 acre-ft |
| Normal Storage | 800 acre-ft |
| Drainage Area | 5 sq mi |
| Max Discharge | 20 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | CHUCK M REIN |
| Owner Type | Private |
| Hazard Classification | Significant |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00381 |
| Federal ID | MT00381 |
| More Info | State Dam Safety Program |