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 1–25 of 44
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Anita Dam Blaine County | 42 | 1995 | High | Fair |
| Arrambide Detention Dam X Valley County | 17 | 1957 | Low | Fair |
| Bailer Dam Dawson County | 33 | — | Low | Fair |
| Beaver Creek Reservoir Dam Hill County | 108 | 1974 | High | Fair |
| Chessman Main Dam Lewis and Clark County | 57 | 1908 | High | Fair |
| Cochrane Cascade County | 105 | 1957 | High | Fair |
| Creedman Coulee Dam Hill County | 22 | 1938 | Low | Fair |
| Deep Cut Detention Dam Valley County | 22 | 1960 | Low | Fair |
| Doggett Reservoir Meagher County | 50 | 1948 | High | Fair |
| Doney Lake #2 (Powell) Powell County | 14 | 1942 | High | Fair |
| Drag Creek Retention Dam Petroleum County | 35 | 1964 | Low | Fair |
| Dry Blood Creek Dam Petroleum County | 40 | 1964 | High | Fair |
| Kerns Lake (Powell) Powell County | 26 | 1965 | High | Fair |
| Lark Detention Dam Phillips County | 41 | 1968 | Low | Fair |
| Lebo #2 Ne Dam Wheatland County | 15 | 1969 | Significant | Fair |
| Little Bunny Detention Dam Phillips County | 24 | 1967 | Low | Fair |
| Long Dam Carter County | 14 | — | Low | Fair |
| Longhorn #1/Horny Detention Dam Valley County | 21 | 1966 | Low | Fair |
| Lower Dry Fork Sanders County | 37 | 1921 | High | Fair |
| Mcclure Detention Dam Prairie County | 15 | 2003 | Low | Fair |
| Mckay Creek Powell County | 33 | 1955 | High | Fair |
| Mission Lake County | 98 | 1935 | High | Fair |
| Mud Lake Powell County | 25 | 1950 | High | Fair |
| Ninepipe Dike 4 Lake County | 10 | 1911 | Undetermined | Fair |
| No. Decker Flood Control Reservoir No. 2 Big Horn County | 52 | — | Significant | Fair |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.