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 1976–2000 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Neufeld No 1 Valley County | 28 | 1966 | Low | Not Rated |
| Neufeld No 2 Valley County | 10 | 1966 | Low | Not Rated |
| Neuman #2 Cascade County | 25 | 1930 | Low | Not Rated |
| Neuman Dam Cascade County | 35 | 1956 | Low | Not Rated |
| Nevada Creek Dam Powell County | 105 | 1938 | High | Satisfactory |
| New Calve Hill County | 20 | 1970 | Low | Not Rated |
| Newhouse Reservoir Blaine County | 27 | 1930 | Low | Not Rated |
| Newlan Creek Dam Meagher County | 131 | 1977 | High | Poor |
| Newman #1 Garfield County | 20 | 1965 | Low | Not Rated |
| Newton #1 Dawson County | 20 | 1945 | Low | Not Rated |
| Nickles Worth Chouteau County | 12 | 1930 | Low | Not Rated |
| Nickwall McCone County | 12 | 1953 | Low | Not Rated |
| Nielsen Rosebud County | 31 | 1973 | Low | Not Rated |
| Nies Carter County | 20 | 1960 | Low | Not Rated |
| Night Fever School Liberty County | 15 | 1960 | Low | Not Rated |
| Nilan East Dam Lewis and Clark County | 51 | 1951 | High | Satisfactory |
| Nilan North Dam Lewis and Clark County | 54 | 1951 | High | Satisfactory |
| Nine Gallons of Milk Hill County | 25 | 1958 | Low | Not Rated |
| Ninemile Dam Lake #1 Hill County | 22 | 1940 | Low | Not Rated |
| Ninepipe Dike 4 Lake County | 10 | 1911 | Undetermined | Fair |
| Nnn Ranch #1 Rosebud County | 8 | 1960 | Low | Not Rated |
| Nnn Ranch #2 Rosebud County | 10 | 1959 | Low | Not Rated |
| No 10 Blaine County | 45 | 1930 | Low | Not Rated |
| Noble (Custer) Custer County | 25 | 1936 | Significant | Not Rated |
| Node Chouteau County | 20 | 1936 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.