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 1851–1875 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Peterson #1 Big Horn County | 16 | 1958 | Low | Not Rated |
| Peterson Lake Missoula County | 12 | 1920 | Low | Not Rated |
| Peterson (Richland) Richland County | 15 | 1957 | Low | Not Rated |
| Petranek Fergus County | 24 | 1938 | Low | Not Rated |
| Petranek Reservoir Fergus County | 34 | 1937 | Low | Not Rated |
| Petri Blaine County | 8 | 1939 | Low | Not Rated |
| Pet Rock Phillips County | 10 | 1956 | Low | Not Rated |
| Pettersen #1 Dawson County | 20 | 1950 | Low | Not Rated |
| Petticoat Junction Fergus County | 30 | 1963 | Low | Not Rated |
| Pfaft #1 Prairie County | 14 | 1942 | Low | Not Rated |
| Philbrick #3 Rosebud County | 22 | 1971 | Low | Not Rated |
| Philips Phillips County | 18 | 1930 | Low | Not Rated |
| Physic Creek Custer County | 25 | 1952 | Low | Not Rated |
| Picard Roosevelt County | 20 | 1945 | Low | Not Rated |
| Picard Reservoir Roosevelt County | 10 | 1937 | Low | Not Rated |
| Pilster Diversion One Dam Carter County | 14 | 1960 | Low | Fair |
| Pine Hills Custer County | 27 | 1950 | Low | Not Rated |
| Pines Dam Valley County | 20 | — | Low | Unsatisfactory |
| Pink Skeeter #1 Garfield County | 12 | 1965 | Low | Not Rated |
| Pink Skeeter #2 Garfield County | 12 | 1965 | Low | Not Rated |
| Pintail Dam Carter County | 22 | 2003 | Low | Not Rated |
| Pioneer Sweet Grass County | 25 | 1968 | Low | Not Rated |
| Pipe Organ Du Dam Beaverhead County | 8 | 2003 | Low | Satisfactory |
| Pippen Valley County | 12 | 1925 | Low | Not Rated |
| Plentywood Sewage Lagoon Sheridan County | 9 | 1954 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.