Robbie is an earth dam located in Sweet Grass County, Montana, built in 1977. It carries a Significant hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 700 ft long, taller than 50% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Robbie
The primary purpose of Robbie is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Justin T Cumin (private). It impounds the Tr-middle Creek near Wheat Basin.
The dam stands 25 feet tall and stretches 700 feet across, and has a maximum storage capacity of 98 acre-feet. Completed in 1977, the structure is 49 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 | Wheat Basin |
| River/Stream | Tr-middle Creek |
| Coordinates | 45.98504, -109.44948 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 700 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 98 acre-ft |
| Max Storage | 98 acre-ft |
| Normal Storage | 54 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Justin T Cumin |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01056 |
| Federal ID | MT01056 |
| More Info | State Dam Safety Program |