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 76–100 of 113
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Madison Dam Madison County | 39 | 1907 | High | Satisfactory |
| Martinsdale, North Dam Wheatland County | 91 | 1939 | High | Satisfactory |
| Mcdonald Lake County | 47 | 1920 | High | Satisfactory |
| Morony Cascade County | 107 | 1929 | High | Satisfactory |
| Moulton Creek Dam #1 Silver Bow County | 67 | 1907 | High | Satisfactory |
| Mt Tunnels Tailings Dam Jefferson County | — | — | High | Satisfactory |
| Mystic Dike Stillwater County | 21 | 1927 | High | Satisfactory |
| Nevada Creek Dam Powell County | 105 | 1938 | High | Satisfactory |
| Nilan East Dam Lewis and Clark County | 51 | 1951 | High | Satisfactory |
| Nilan North Dam Lewis and Clark County | 54 | 1951 | High | Satisfactory |
| North Fork of Smith River Dam Meagher County | 91 | 1936 | High | Satisfactory |
| Olson, Oscar (Meagher) Meagher County | 40 | 1959 | High | Satisfactory |
| Peace Pond Ravalli County | 22 | 1960 | High | Satisfactory |
| Pike Creek Dam Fergus County | 81 | 1977 | High | Satisfactory |
| Pipe Organ Du Dam Beaverhead County | 8 | 2003 | Low | Satisfactory |
| Pr-19 Retention Dam Phillips County | 23 | 1936 | High | Satisfactory |
| Rainbow Cascade County | 44 | 1910 | High | Satisfactory |
| Rattlesnake Dam Dawson County | 22 | 1962 | Low | Satisfactory |
| Re-Regulating Stillwater County | 15 | 1979 | Low | Satisfactory |
| Ruby Dam Madison County | 111 | 1938 | High | Satisfactory |
| Ryan Cascade County | 82 | 1915 | High | Satisfactory |
| Scott Coulee Dam Hill County | 58 | 1955 | High | Satisfactory |
| Smith Lake Dam Flathead County | 12 | 1938 | High | Satisfactory |
| Spartan/Playfair Park Retention Basins Missoula County | 8 | 2003 | High | Satisfactory |
| Stillwater Hertzler Tailings Dam Stillwater County | — | — | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.