Montana Dams
2,990 dams tracked by the National Inventory of Dams
Total Dams
2,990
High Hazard
188
6.3%
Poor / Unsatisfactory
132
Average Age
74 yrs
Hazard Classification
High188 (6.3%)
Significant193 (6.5%)
Low2,606 (87.2%)
Condition Assessment
Satisfactory113 (3.8%)
Fair44 (1.5%)
Poor / Unsatisfactory132 (4.4%)
Not Rated2,701 (90.3%)
Federal
278
State
151
Local
84
Private
2,466
Tallest Dams
- Yankee Doodle Tailings Dam570 ft
- Hungry Horse Dam564 ft
- Libby Dam422 ft
- Noxon Rapids260 ft
- Fort Peck Dam256 ft
High Hazard Dams
- Yankee Doodle Tailings DamHigh
- Hungry Horse DamHigh
- Libby DamHigh
- Noxon RapidsHigh
- Fort Peck DamHigh
Poor Condition Dams
All Dams in Montana
Showing 2151–2175 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Shoup Lake Powell County | 18 | 1925 | Low | Not Rated |
| Shumaker #1 Prairie County | 18 | 1965 | Low | Not Rated |
| Shupak #1 Carbon County | 18 | 1963 | Low | Not Rated |
| Sibra Chouteau County | 17 | 1960 | Low | Not Rated |
| Sidney Dam Carter County | 32 | — | Low | Not Rated |
| Sidney Sewage Lagoon Richland County | 9 | 1960 | Low | Not Rated |
| Sigurd Hill County | 14 | 1970 | Low | Not Rated |
| Sikorski & Sons Fallon County | 30 | 1952 | Low | Not Rated |
| Silver Lake East Dam Deer Lodge County | 11 | 1918 | Low | Not Rated |
| Silver Swan Blaine County | 15 | 1945 | Low | Not Rated |
| Silvertip Retention Dam Prairie County | 18 | 2003 | Low | Not Rated |
| Simple Simon Dam Phillips County | 20 | — | Low | Not Rated |
| Sims #1 Rosebud County | 25 | 1965 | Low | Not Rated |
| Singer Sayer Hill County | 25 | 1936 | Low | Not Rated |
| Sister Sledge Liberty County | 28 | 1960 | Low | Not Rated |
| Siversten Blaine County | 20 | 1954 | Low | Not Rated |
| Skari and Sons #1 Liberty County | 10 | 1958 | Low | Not Rated |
| Skeeter Detention Dam Valley County | 21 | 1964 | Low | Unsatisfactory |
| Skorupa Pondera County | 8 | 1953 | Low | Not Rated |
| Skoyen Blaine County | 20 | 1958 | Low | Not Rated |
| Slimy Stock McCone County | 26 | 1941 | Low | Not Rated |
| Sluggett #1 Fergus County | 14 | 1960 | Low | Not Rated |
| Sluggett #2 Fergus County | 9 | 1960 | Low | Not Rated |
| Smart Mans Dam Chouteau County | 12 | 1960 | Low | Not Rated |
| Smile #1 Dawson County | 20 | 1962 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.