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 126–150 of 188
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Moulton Creek Dam #1 Silver Bow County | 67 | 1907 | High | Satisfactory |
| Mt Tunnels Tailings Dam Jefferson County | — | — | High | Satisfactory |
| Mud Lake Powell County | 25 | 1950 | High | Fair |
| Mystic Dike Stillwater County | 21 | 1927 | High | Satisfactory |
| Nelson Dike C Phillips County | 28 | 1915 | High | Not Available |
| Nevada Creek Dam Powell County | 105 | 1938 | High | Satisfactory |
| Newlan Creek Dam Meagher County | 131 | 1977 | High | Poor |
| Nilan East Dam Lewis and Clark County | 51 | 1951 | High | Satisfactory |
| Nilan North Dam Lewis and Clark County | 54 | 1951 | High | Satisfactory |
| Northern Pacific Reservoir Dam Jefferson County | 35 | 1935 | High | Not Rated |
| North Fork of Smith River Dam Meagher County | 91 | 1936 | High | Satisfactory |
| Noxon Rapids Sanders County | 260 | 1960 | High | Fair |
| Olson, Oscar (Meagher) Meagher County | 40 | 1959 | High | Satisfactory |
| Pablo Lake County | 47 | 1912 | High | Unsatisfactory |
| Park Lake Dam Jefferson County | 31 | 1872 | High | Not Rated |
| Peace Pond Ravalli County | 22 | 1960 | High | Satisfactory |
| Pear Lake Dam Beaverhead County | 19 | 1904 | High | Poor |
| Petrolia Petroleum County | 76 | 1951 | High | Poor |
| Pike Creek Dam Fergus County | 81 | 1977 | High | Satisfactory |
| Pishkun Dike 5 Teton County | 11 | 1931 | High | Not Available |
| Powell Powell County | 52 | 1981 | High | Poor |
| Pr-19 Retention Dam Phillips County | 23 | 1936 | High | Satisfactory |
| Rainbow Cascade County | 44 | 1910 | High | Satisfactory |
| Ruby Dam Madison County | 111 | 1938 | High | Satisfactory |
| Ryan Cascade County | 82 | 1915 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.