18Total Dams
4High Hazard
3Significant
Dam Safety in Sweet Grass County, Montana
Sweet Grass County has 18 dams tracked in the National Inventory of Dams. Of these, 4 are classified as high hazard — meaning failure would probably cause loss of human life. Another 3 carry a significant hazard classification. Currently, 3 dams have a condition assessment of poor or unsatisfactory.
The average dam in Sweet Grass County is 76 years old. The most common purpose is irrigation. The tallest dam is Rosann Rosanna Dana at 50 ft.
Explore more: Oldest dams in Montana · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Lower Glasston Dam | High | Poor | 30 | Irrigation | 1912 |
| Upper Glasston West Dam | High | Poor | 22 | Irrigation | 1912 |
| Upper Glasston North Dam | High | Poor | 20 | Irrigation | 1912 |
| East Boulder Tailings Dam | High | Satisfactory | 0 | Tailings | |
| Robbie | Significant | Not assessed | 25 | Irrigation | 1977 |
| Ryan-tronrud Dam | Significant | Not assessed | 22 | Irrigation | 1956 |
| Donald | Significant | Not assessed | 20 | Recreation | 1963 |
| Rosann Rosanna Dana | Low | Not assessed | 50 | Other | 1939 |
| Marstaeller Irrigation Dam | Low | Not assessed | 39 | Irrigation | 1984 |
| Pioneer | Low | Not assessed | 25 | Other | 1968 |
| Holzhey | Low | Not assessed | 21 | Irrigation | 1956 |
| Cain | Low | Not assessed | 20 | Irrigation | 1965 |
| Smoky Dam | Low | Not assessed | 20 | Other | 1968 |
| Cramer (sweet Grass) | Low | Not assessed | 15 | Irrigation | 1960 |
| Big Timber Sewage Lagoon | Low | Not assessed | 15 | Other | 1959 |
| Beley Pond | Low | Not assessed | 14 | Irrigation | 1940 |
| Burns Dam | Low | Not assessed | 12 | Irrigation | 1960 |
| Lavold Dam | Low | Not assessed | 8 | Irrigation | 1913 |