Donald
Donald is an earth dam located in Sweet Grass County, Montana, built in 1963. It carries a Significant hazard potential classification.
About Donald
The primary purpose of Donald is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Cayuse Livestock Co (private). It impounds the Fish Creek near Greycliff.
The dam stands 20 feet tall and stretches 380 feet across, and has a maximum storage capacity of 10 acre-feet. Completed in 1963, 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 | Greycliff |
| River/Stream | Fish Creek |
| Coordinates | 46.17005, -109.99466 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 380 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 10 acre-ft |
| Max Storage | 10 acre-ft |
| Normal Storage | 10 acre-ft |
| Max Discharge | 200 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | CAYUSE LIVESTOCK CO |
| Owner Type | Private |
| Hazard Classification | Significant |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00382 |
| Federal ID | MT00382 |
| More Info | State Dam Safety Program |